Organic chemists

Richard Martin Willstätter FRS(For) HFRSE (German pronunciation: [ˈʁɪçaʁt ˈvɪlˌʃtɛtɐ] , 13 August 1872 – 3 August 1942) was a German organic chemist whose study of the structure of plant pigments, chlorophyll included, won him the 1915 Nobel Prize for Chemistry. Willstätter invented paper chromatography following the initial description of the separation technique by Mikhail Tsvet.

Archibald Scott Couper (; 31 March 1831 – 11 March 1892) was a Scottish chemist who proposed an early theory of chemical structure and bonding. He developed the concepts of tetravalent carbon atoms linking together to form large molecules, and that the bonding order of the atoms in a molecule can be determined from chemical evidence.

Friedrich Hermann Leuchs (8 August 1879 – 2 May 1945) was a German chemist.