Adolf Friedrich Johann Butenandt was a German biochemist. He was awarded the Nobel Prize in Chemistry in 1939 for his "work on sex hormones." He initially rejected the award in accordance with government policy, but accepted it in 1949 after World War II. He was President of the Max Planck Society from 1960 to 1972. He was also the first, in 1959, to discover the structure of the sex pheromone of silkworms, which he named bombykol. The Nobel Prize in Chemistry 1939, announced November 9, 1939. Adolf Butenandt (1/2), “for his work on sex hormones”. Leopold Ruzicka (1/2), “for his work on polymethylenes and higher terpenes”. Adolf Butenandt: born 1903, Bremerhaven-Lehe, Germany. Leopold Ruzicka: born 1887, Vukovar, Austria-Hungary (now Croatia). Wiki link Wiki link Data: the Nobel Foundation (CC0).