Vladimir Prelog was a Croatian-Swiss organic chemist who received the 1975 Nobel Prize in chemistry for his research into the stereochemistry of organic molecules and reactions. Prelog was born and grew up in Sarajevo. He lived and worked in Prague, Zagreb and Zürich during his lifetime.

Osijek is the fourth-largest city in Croatia, with a population of 96,848 in 2021. It is the largest city and the economic and cultural centre of the eastern Croatian region of Slavonia, as well as the administrative centre of Osijek-Baranja County. Osijek is on the right bank of the Drava River, 25 km (16 mi) upstream of its confluence with the Danube, at an elevation of 94 m (308 ft).