IUPAC:(1R,3aS,3bR,9bS,11aS)-5',5',11a-trimethyl-2,3,3a,3b,4,5,9b,10,11,11a-decahydrospiro[cyclopenta[a]phenanthrene-1,2'-oxan]-6'-one
IUPAC:(1R,3aS,3bR,9bS,11aS)-5',5',11a-trimethyl-2,3,3a,3b,4,5,9b,10,11,11a-decahydrospiro[cyclopenta[a]phenanthrene-1,2'-oxan]-6'-one