(2'R,8R,9S,10R,13S,14S)-10,13-dimethyl-1,7,8,9,10,11,12,13,15,16-decahydro-3'H-spiro[cyclopenta[a]phenanthrene-17,2'-furan]-3,5',6(2H,4'H,14H)-trione
(2'R,8R,9S,10R,13S,14S)-10,13-dimethyl-1,7,8,9,10,11,12,13,15,16-decahydro-3'H-spiro[cyclopenta[a]phenanthrene-17,2'-furan]-3,5',6(2H,4'H,14H)-trione