IUPAC:(1R,3aS,3bR,9aR,9bS,11aS)-9a,11a-dimethyl-2,3,3a,3b,7,8,9,9a,9b,10,11,11a-dodecahydro(4,4',4',6,8,8-2H6)spiro[cyclopenta[a]phenanthrene-1,2'-oxolane]-5',7-dione
IUPAC:(1R,3aS,3bR,9aR,9bS,11aS)-9a,11a-dimethyl-2,3,3a,3b,7,8,9,9a,9b,10,11,11a-dodecahydro(4,4',4',6,8,8-2H6)spiro[cyclopenta[a]phenanthrene-1,2'-oxolane]-5',7-dione