Dimethyl sulfoxide

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"DMSO" redirects here. For other uses, see DMSO (disambiguation).
Dimethyl sulfoxide
Dimethylsulfoxid.svg
Stereo structural formula of dimethyl sulfoxide with an explicit electron pair and assorted dimensions
Spacefill model of dimethyl sulfoxide
Sample of Dimethyl sulfoxide 01.jpg
A sample of dimethyl sulfoxide
Names
IUPAC name
Dimethyl sulfoxide
Systematic IUPAC name
(Methanesulfinyl)methane (substitutive)
Dimethyl(oxido)sulfur (additive)
Other names
Methylsulfinylmethane
Methyl sulfoxide
Identifiers
3D model (JSmol)
Abbreviations DMSO, Me2SO
506008
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.000.604
EC Number 200-664-3
1556
KEGG
MeSH Dimethyl+sulfoxide
RTECS number PV6210000
UNII
Properties
C2H6OS
Molar mass 78.13 g·mol−1
Appearance Colourless liquid
Density 1.1004 g cm−3
Melting point 19 °C (66 °F; 292 K)
Boiling point 189 °C (372 °F; 462 K)
Miscible
Solubility in diethyl ether Not soluble
Acidity (pKa) 35[1]
1.479
εr = 48
Viscosity 1.996 cP at 20 °C
Structure
Cs
trigonal pyramidal
3.96 D
Pharmacology
G04BX13 (WHO) M02AX03 (WHO)
Hazards
Main hazards Irritant and flammable
Safety data sheet See: data page
Oxford MSDS
R-phrases (outdated) R36/37/38
S-phrases (outdated) S26, S37/39
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuelHealth code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
2
1
0
Flash point 89 °C
Related compounds
Related sulfoxides
 diethyl sulfoxide
Related compounds
 sodium methylsulfinylmethylide,
dimethyl sulfide,
dimethyl sulfone,
acetone
Supplementary data page
Refractive index (n),
Dielectric constant (εr), etc.
Thermodynamic
data
 Phase behaviour
solid–liquid–gas
UV, IR, NMR, MS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☑Y verify (what is ☑Y☒N ?)
Infobox references

Dimethyl sulfoxide (DMSO) is an organosulfur compound with the formula (CH3)2SO. This colorless liquid is an important polar aprotic solvent that dissolves both polar and nonpolar compounds and is miscible in a wide range of organic solvents as well as water. It has a relatively high melting point. DMSO has the unusual property that many individuals perceive a garlic-like taste in the mouth after contact with the skin.[2]

In terms of chemical structure, the molecule has idealized Cs symmetry. It has a trigonal pyramidal molecular geometry consistent with other three-coordinate S(IV) compounds,[3] with a nonbonded electron pair on the approximately tetrahedral sulfur atom.

Synthesis and production[edit]

It was first synthesized in 1866 by the Russian scientist Alexander Zaytsev, who reported his findings in 1867.[4] Dimethyl sulfoxide is produced industrially from dimethyl sulfide, a by-product of the Kraft process, by oxidation with oxygen or nitrogen dioxide.[5]

Reactions[edit]

Reactions with electrophiles[edit]

The sulfur center in DMSO is nucleophilic toward soft electrophiles and the oxygen is nucleophilic toward hard electrophiles. With methyl iodide it forms trimethylsulfoxonium iodide, [(CH3)3SO]I:

(CH3)2SO + CH3I → [(CH3)3SO]I

This salt can be deprotonated with sodium hydride to form the sulfur ylide:

[(CH3)3SO]I + NaH → (CH3)2S(CH2)O + NaI + H2

Acidity[edit]

The methyl groups of DMSO are only weakly acidic, with a pKa=35. For this reason, the basicities of many weakly basic organic compounds have been examined in this solvent.

Deprotonation of DMSO requires strong bases like lithium diisopropylamide and sodium hydride. Stabilization of the resultant carbanion is provided by the S(O)R group. The sodium derivative of DMSO formed in this way is referred to as "dimsyl sodium". It is a base, e.g., for the deprotonation of ketones to form sodium enolates, phosphonium salts to form Wittig reagents, and formamidinium salts to form diaminocarbenes. It is also a potent nucleophile.

Oxidant[edit]

In organic synthesis, DMSO is used as a mild oxidant,[6] as illustrated by the Pfitzner–Moffatt oxidation and the Swern oxidation.[7]

Ligand[edit]

Related to its ability to dissolve many salts, DMSO is a common ligand in coordination chemistry.[8] Illustrative is the complex dichlorotetrakis(dimethyl sulfoxide)ruthenium(II) (RuCl2(dmso)4). In this complex, three DMSO ligands are bonded to ruthenium through sulfur. The fourth DMSO is bonded through oxygen. In general, the oxygen-bonded mode is more common.

Applications[edit]

Solvent[edit]

Distillation of DMSO requires a partial vacuum to achieve a lower boiling point.

DMSO is a polar aprotic solvent and is less toxic than other members of this class, such as dimethylformamide, dimethylacetamide, N-methyl-2-pyrrolidone, and HMPA. DMSO is frequently used as a solvent for chemical reactions involving salts, most notably Finkelstein reactions and other nucleophilic substitutions. It is also extensively used as an extractant in biochemistry and cell biology.[9] Because DMSO is only weakly acidic, it tolerates relatively strong bases and as such has been extensively used in the study of carbanions. A set of non-aqueous pKa values (C-H, O-H, S-H and N-H acidities) for thousands of organic compounds have been determined in DMSO solution.[10][11]

Because of its high boiling point, 189 °C (372 °F), DMSO evaporates slowly at normal atmospheric pressure. Samples dissolved in DMSO cannot be as easily recovered compared to other solvents, as it is very difficult to remove all traces of DMSO by conventional rotary evaporation. One technique to fully recover samples is removal of the organic solvent by evaporation followed by addition of water (to dissolve DMSO) and cryodesiccation to remove both DMSO and water. Reactions conducted in DMSO are often diluted with water to precipitate or phase-separate products. The relatively high freezing point of DMSO, 18.5 °C (65.3 °F), means that at, or just below, room temperature it is a solid, which can limit its utility in some chemical processes (e.g. crystallization with cooling).

In its deuterated form (DMSO-d6), it is a useful solvent for NMR spectroscopy, again due to its ability to dissolve a wide range of analytes, the simplicity of its own spectrum, and its suitability for high-temperature NMR spectroscopic studies. Disadvantages to the use of DMSO-d6 are its high viscosity, which broadens signals, and its hygroscopicity, which leads to an overwhelming H2O resonance in the 1H NMR spectrum. It is often mixed with CDCl3 or CD2Cl2 for lower viscosity and melting points.

DMSO is finding increased use in manufacturing processes to produce microelectronic devices.[12] It is widely used to strip photoresist in TFT-LCD 'flat panel' displays and advanced packaging applications (such as wafer-level packaging / solder bump patterning). It also used in biopreservation especially stem cell banking. DMSO is an effective paint stripper, being safer than many of the others such as nitromethane and dichloromethane.

Because of its ability to dissolve many kinds of compounds, DMSO plays a role in sample management and high-throughput screening operations in drug design.[13]

Biology[edit]

DMSO is used in polymerase chain reaction (PCR) to inhibit secondary structures in the DNA template or the DNA primers. It is added to the PCR mix before reacting, where it interferes with the self-complementarity of the DNA, minimizing interfering reactions.[14]

DMSO in a PCR reaction is applicable for supercoiled plasmids (to relax before amplification) or DNA templates with high GC-content (to decrease thermostability). For example, 10% final concentration of DMSO in the PCR mixture with Phusion decreases primer annealing temperature (i.e. primer melting temperature) by 5.5–6.0 °C (9.9–10.8 °F).[15]

It is well known as a reversible cell cycle arrester at phase G1 of human lymphoid cells.[16]

DMSO may also be used as a cryoprotectant, added to cell media to reduce ice formation and thereby prevent cell death during the freezing process.[17] Approximately 10% may be used with a slow-freeze method, and the cells may be frozen at −80 °C (−112 °F) or stored in liquid nitrogen safely.

DMSO has been used as a co-solvent to assist absorption of the flavonol glycoside Icariin into the C. elegans nematode worm.[18]

In cell culture, DMSO is used to induce differentiation of P19 embryonic carcinoma cells into cardiomyocytes and skeletal muscle cells.

Medicine[edit]

Use of DMSO in medicine dates from around 1963, when an Oregon Health & Science University Medical School team, headed by Stanley Jacob, discovered it could penetrate the skin and other membranes without damaging them and could carry other compounds into a biological system. In medicine, DMSO is predominantly used as a topical analgesic, a vehicle for topical application of pharmaceuticals, as an anti-inflammatory, and an antioxidant.[19] Because DMSO increases the rate of absorption of some compounds through organic tissues, including skin, it is used in some transdermal drug delivery systems. Its effect may be enhanced with the addition of EDTA. It is frequently compounded with antifungal medications, enabling them to penetrate not just skin but also toenails and fingernails.

DMSO has been examined for the treatment of numerous conditions and ailments, but the U.S. Food and Drug Administration (FDA) has approved its use only for the symptomatic relief of patients with interstitial cystitis.[20] A 1978 study concluded that DMSO brought significant relief to the majority of the 213 patients with inflammatory genitourinary disorders that were studied.[21] The authors recommended DMSO for genitourinary inflammatory conditions not caused by infection or tumor in which symptoms were severe or patients failed to respond to conventional therapy.

A Gel containing DMSO, dexpanthenol, and heparin, is sold in Germany and eastern Europe (commercialized under the Dolobene[22] brand) for topical use in sprains, tendinitis, and local inflammation.[23]

In interventional radiology, DMSO is used as a solvent for ethylene vinyl alcohol in the Onyx liquid embolic agent, which is used in embolization, the therapeutic occlusion of blood vessels.

In medical research, DMSO is often used as a drug vehicle in in vivo and in vitro experiments. However, when a researcher is unaware of its pleiotropic effects, or when the control groups are not carefully planned, a bias can occur; an effect of DMSO can be falsely attributed to the drug.[24] For example, even a very low dose of DMSO has a powerful protective effect against paracetamol (acetaminophen)-induced liver injury in mice.[25]

In cryobiology DMSO has been used as a cryoprotectant and is still an important constituent of cryoprotectant vitrification mixtures used to preserve organs, tissues, and cell suspensions. Without it, up to 90% of frozen cells will become inactive. It is particularly important in the freezing and long-term storage of embryonic stem cells and hematopoietic stem cells, which are often frozen in a mixture of 10% DMSO, a freezing medium, and 30% fetal bovine serum. In the cryogenic freezing of heteroploid cell lines (MDCK, VERO, etc.) a mixture of 10% DMSO with 90% EMEM (70% EMEM + 30% fetal bovine serum + antibiotic mixture) is used. As part of an autologous bone marrow transplant the DMSO is re-infused along with the patient's own hematopoietic stem cells.

DMSO is metabolized by disproportionation to dimethyl sulfide and dimethyl sulfone. It is subject to renal and pulmonary excretion. A possible side effect of DMSO is therefore elevated blood dimethyl sulfide, which may cause a blood borne halitosis symptom.[citation needed]

Alternative medicine[edit]

DMSO is marketed as an alternative medicine. Its popularity as an alternative cure is stated to stem from a 60 Minutes documentary featuring an early proponent.[26] However, DMSO is an ingredient in some products listed by the U.S. FDA as fake cancer cures[27] and the FDA has had a running battle with distributors.[26] One such distributor is Mildred Miller, who promoted DMSO for a variety of disorders and was consequently convicted of Medicare fraud.[28]

The use of DMSO as an alternative treatment for cancer is of particular concern, as it has been shown to interfere with a variety of chemotherapy drugs, including cisplatin, carboplatin, and oxaliplatin.[29] There is insufficient evidence to support the hypothesis that DMSO has any effect,[30] and most sources agree that its history of side effects when tested warrants caution when using it as a dietary supplement, for which it is marketed heavily with the usual disclaimer.

Veterinary medicine[edit]

DMSO is commonly used in veterinary medicine as a liniment for horses, alone or in combination with other ingredients. In the latter case, often, the intended function of the DMSO is as a solvent, to carry the other ingredients across the skin. Also in horses, DMSO is used intravenously, again alone or in combination with other drugs. It is used alone for the treatment of increased intracranial pressure and/or cerebral edema in horses.

Taste[edit]

The perceived garlic taste upon skin contact with DMSO may be due to nonolfactory activation of TRPA1 receptors in trigeminal ganglia.[31] Unlike dimethyl and diallyl disulfide (also with odors resembling garlic), the mono- and tri- sulfides (typically with foul odors), and other similar structures, the pure chemical DMSO is odorless.

Safety[edit]

Toxicity[edit]

DMSO is a non-toxic solvent with a median lethal dose higher than ethanol (DMSO: LD50 Oral-Rat-14,500 mg/kg;[32] ethanol: LD50 Oral-Rat-7,060 mg/kg [33]).

Early clinical trials with DMSO were stopped because of questions about its safety, especially its ability to harm the eye. The most commonly reported side effects include headaches and burning and itching on contact with the skin. Strong allergic reactions have been reported.[full citation needed] DMSO can cause contaminants, toxins, and medicines to be absorbed through the skin, which may cause unexpected effects. DMSO is thought to increase the effects of blood thinners, steroids, heart medicines, sedatives, and other drugs. In some cases this could be harmful or dangerous.[34] It is a developmental neurotoxin.[35] In Australia it is listed as a Schedule 4 (S4) Drug, and a company has been prosecuted for adding it to products as a preservative.[36]

Because DMSO easily penetrates the skin, substances dissolved in DMSO may be quickly absorbed. Glove selection is important when working with DMSO. Butyl rubber, fluoroelastomer, neoprene, or thick (15 mil) latex gloves are recommended.[37] Nitrile gloves, which are very commonly used in chemical laboratories, may protect from brief contact but have been found to degrade rapidly with exposure to DMSO.[38]

On September 9, 1965, The Wall Street Journal reported that a manufacturer of the chemical warned that the death of an Irish woman after undergoing DMSO treatment for a sprained wrist may have been due to the treatment, although no autopsy was done, nor was a causal relationship established.[39] Clinical research using DMSO was halted and did not begin again until the National Academy of Sciences (NAS) published findings in favor of DMSO in 1972.[40] In 1978, the US FDA approved DMSO for treating interstitial cystitis. In 1980, the US Congress held hearings on claims that the FDA was slow in approving DMSO for other medical uses. In 2007, the US FDA granted "fast track" designation on clinical studies of DMSO's use in reducing brain tissue swelling following traumatic brain injury.[40] DMSO exposure to developing mouse brains can produce brain degeneration. This neurotoxicity could be detected at doses as low as 0.3 mL/kg, a level exceeded in children exposed to DMSO during bone marrow transplant.[41]

DMSO disposed into sewers can also cause odor problems in municipal effluents: waste water bacteria transform DMSO under hypoxic (anoxic) conditions into dimethyl sulfide (DMS) that has a strong disagreeable odor, similar to rotten cabbage.[42] However, chemically pure DMSO is odorless because of the lack of C-S-C (sulfide) and C-S-H (mercaptan) linkages. Deodorization of DMSO is achieved by removing the odorous impurities it contains.[43]

Explosion hazard[edit]

Dimethyl sulfoxide can produce an explosive reaction when exposed to acyl chlorides; at a low temperature, this reaction produces the oxidant for Swern oxidation.

DMSO can decompose at the boiling temperature of 189 °C at normal pressure,[44] possibly leading to an explosion. The decomposition is catalyzed by acids and bases and therefore can be relevant at even lower temperatures.[44] A strong to explosive reaction also takes place in combination with halogen compounds, metal nitrides, metal perchlorates, sodium hydride, periodic acid and fluorinating agents.[44][45][full citation needed]

See also[edit]

References[edit]

  1. ^ Matthews, W.S., Bares, J.E., Bartmess, J.E., Bordwell, F.G., Cornforth, F.J., Drucker, G.E., Margolin, Z., McCallum, R.J., McCollum, G.J., Vanier, N.R.; Bares; Bartmess; Bordwell; Cornforth; Drucker; Margolin; McCallum; McCollum; Vanier (1975). "Equilibrium acidities of carbon acids. VI. Establishment of an absolute scale of acidities in dimethyl sulfoxide solution". J. Am. Chem. Soc. 97 (24): 7006–7014. doi:10.1021/ja00857a010. 
  2. ^ Novak, K. M., ed. (2002). Drug Facts and Comparisons (56th ed.). St. Louis, Missouri: Wolters Kluwer Health. p. 619. ISBN 1-57439-110-0. 
  3. ^ R. Thomas, C. B. Shoemaker and K. Eriks "The molecular and crystal structure of dimethyl sulfoxide, (H3C)2SO" Acta Crystallogr. 1966. vol. 21, pp. 12-20. doi:10.1107/S0365110X66002263
  4. ^ A. Saytzeff (1867) "Ueber die Einwirkung von Saltpetersäure auf Schwefelmethyl und Schwefeläthyl" (On the effect of nitric acid on methyl sulfide and ethyl sulfide) Annalen der Chemie und Pharmacie, 144: 148–156; see page 150, where dimethyl sulfoxide is called "Dimethylschwefeloxyd".
  5. ^ Kathrin-Maria Roy "Sulfones and Sulfoxides" in Ullmann's Encyclopedia of Industrial Chemistry, 2002, Wiley-VCH, Weinheim. doi:10.1002/14356007.a25_487
  6. ^ Epstein WW, Sweat FW (March 1967). "Dimethyl Sulfoxide Oxidations". Chemical Reviews. 67 (3): 247–260. doi:10.1021/cr60247a001. 
  7. ^ Tidwell TT. (1990). "Oxidation of Alcohols by Activated Dimethyl Sulfoxide and Related Reactions: An Update". Synthesis. 1990 (10): 857–870. doi:10.1055/s-1990-27036. 
  8. ^ Calligaris, Mario (2004). "Structure and bonding in metal sulfoxide complexes: An update". Coordination Chemistry Reviews. 248 (3–4): 351–375. doi:10.1016/j.ccr.2004.02.005. 
  9. ^ "DMSO". exactantigen.com. Retrieved 2009-10-02. 
  10. ^ Bordwell FG (1988). "Equilibrium acidities in dimethyl sulfoxide solution". Accounts of Chemical Research. 21 (12): 456–463. doi:10.1021/ar00156a004. 
  11. ^ Bordwell pKa Table in DMSO Archived October 9, 2008, at the Wayback Machine.
  12. ^ Kvakovszky G, McKim AS, Moore J.; McKim; Moore (2007). "A Review of Microelectronic Manufacturing Applications Using DMSO-Based Chemistries". ECS Transactions. 11 (2): 227–234. doi:10.1149/1.2779383. 
  13. ^ Balakin KV, Savchuk NP, Tetko IV.; Savchuk; Tetko (2006). "In Silico Approaches to Prediction of Aqueous and DMSO Solubility of Drug-Like Compounds: Trends, Problems and Solutions". Current Medicinal Chemistry. 13 (2): 223–241. doi:10.2174/092986706775197917. PMID 16472214. 
  14. ^ Chakrabarti R, Schutt CE.; Schutt (August 2001). "The enhancement of PCR amplification by low molecular-weight sulfones". Gene. 274 (1–2): 293–298. doi:10.1016/S0378-1119(01)00621-7. PMID 11675022. 
  15. ^ "Guidelines for PCR Optimization with Phusion High-Fidelity DNA Polymerase". 
  16. ^ Sawai M1, Takase K, Teraoka H, Tsukada K. (1990). "Reversible G1 arrest in the cell cycle of human lymphoid cell lines by dimethyl sulfoxide". Exp. Cell Res. 187: 4–10. doi:10.1016/0014-4827(90)90108-m. PMID 2298260. 
  17. ^ Pegg, DE. (2007). Day JG, Stacey GN, eds. "Principles of Cryopreservation". Cryopreservation and Freeze-Drying Protocols, Second Edition. Methods in Molecular Biology. Humana Press. 368: 39–57. doi:10.1007/978-1-59745-362-2_3. ISBN 978-1-58829-377-0. ISSN 1064-3745. PMID 18080461. 
  18. ^ Cai WJ, Huang JH, Zhang SQ, Wu B, Kapahi P, Zhang XM, Shen ZY; Huang; Zhang; Wu; Kapahi; Zhang; Shen (2011). Blagosklonny, Mikhail V, ed. "Icariin and its derivative icariside II extend healthspan via insulin/IGF-1 pathway in C. elegans". PLoS ONE. 6 (12): e28835. Bibcode:2011PLoSO...628835C. doi:10.1371/journal.pone.0028835. PMC 3244416 Freely accessible. PMID 22216122. 
  19. ^ Johannes Geiss (2001). The century of space science. Kluwer Academic. p. 20. ISBN 0-7923-7195-X. Retrieved Aug 7, 2011. 
  20. ^ "Import Alert 62-06". www.accessdata.fda.gov. Retrieved 2017-03-05. 
  21. ^ Shirley SW, Stewart BH, Mirelman S.; Stewart; Mirelman (March 1978). "Dimethyl Sulfoxide in Treatment of Inflammatory Genitourinary Disorders". Urology. 11 (3): 215–220. doi:10.1016/0090-4295(78)90118-8. PMID 636125. 
  22. ^ "Dolobene Gel 100 g - Grovet.com". www.grovet.com. Retrieved 2016-11-12. 
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  25. ^ Kelava T, Cavar I; Cavar; Culo (Oct 2010). "Influence of small doses of various drug vehicles on acetaminophen-induced liver injury". Can J Physiol Pharmacol. 88 (10): 980–87. doi:10.1139/Y10-065. PMID 20962895. 
  26. ^ a b >DMSO, National Council Against Health Fraud
  27. ^ 187 fake cancer "cures" to avoid, FDA
  28. ^ "DMSO". www.ncahf.org. Retrieved 2017-03-05. 
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  32. ^ [1][2], Material Safety Data Sheet DMSO
  33. ^ [3], Material Safety Data Sheet Ethanol
  34. ^ DMSO information from American Cancer Society
  35. ^ Hanslick, JL; Lau, K; Noguchi, KK; Olney, JW; Zorumski, CF; Mennerick, S; Farber, NB (2009). "Dimethyl sulfoxide (DMSO) produces widespread apoptosis in the developing central nervous system". Neurobiology of disease. 34 (1): 1–10. doi:10.1016/j.nbd.2008.11.006. PMC 2682536 Freely accessible. PMID 19100327. 
  36. ^ Brisbane drug company convicted of counterfeiting, Therapeutic Goods Agency
  37. ^ Rubber Chemical Resistance Chart
  38. ^ "Chemical hygiene plan" (PDF). Cornell University. October 1999. Retrieved 2010-04-12. 
  39. ^ Carley W. (September 9, 1965). "DMSO may have caused death of woman, makers of 'Wonder' drug warn doctors". The Wall Street Journal. New York City. 
  40. ^ a b http://www.fda.gov/ForIndustry/ImportProgram/ImportAlerts/ucm162294.htm[dead link]
  41. ^ Hanslick JL, Lau K, Noguchi KK, Olney JW, Zorumski CF, Mennerick S, Farber NB.; Lau; Noguchi; Olney; Zorumski; Mennerick; Farber (April 2009). "Dimethyl sulfoxide (DMSO) produces widespread apoptosis in the developing central nervous system". Neurobiology of Disease. 34 (1): 1–10. doi:10.1016/j.nbd.2008.11.006. PMC 2682536 Freely accessible. PMID 19100327. 
  42. ^ Glindemann D, Novak J, Witherspoon J.; Novak; Witherspoon (January 2006). "Dimethyl sulfoxide (DMSO) waste residues and municipal waste water odor by dimethyl sulfide (DMS): the North-East WPCP plant of Philadelphia". Environmental Science and Technology. 40 (1): 202–207. Bibcode:2006EnST...40..202G. doi:10.1021/es051312a. PMID 16433352. 
  43. ^ George Kvakovszky, et. al., "Process for preparing low malodorous dimethyl sulfoxide", US patent application number 20090005601 (2009).
  44. ^ a b c Roth/Weller: Gefährliche Chemische Reaktionen, ecomed Sicherheit, Verlagsgruppe Hüthig Jehle Rehm, Landsberg/Lech, 31. Ergänzungslieferung 8/2000.
  45. ^ Thieme Römpp Online

External links[edit]

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