(5S,8R,9S,10S,13R,14S)-10,13-dimethyl-1,2,4,5,6,7,8,9,11,12,14,15-dodecahydrocyclopenta[a]phenanthren-3-one 18339-16-7 5alpha-Androst-16-en-3-one 16-(5alpha)Androsten-3-one 3-Keto-5alpha,16-androstene A8008_SIGMA ZINC04352602 MLS000069748 SMR000059223 W505900_ALDRICH CHEBI:37894 androstenone