The molecule is a 3-dehydro-4-methylzymosterol in which the methyl substituent at position 4 has alpha configuration. It is an intermediate in the biosynthesis of cholesterol.
(4S,5S,10S,13R,14R,17R)-4,10,13-trimethyl-17-[(2R)-6-methylhept-5-en-2-yl]-1,2,4,5,6,7,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthren-3-one