(8R,9S,10R,13S,14S,17S)-10,13-Dimethyl-1,8,9,10,11,12,13,14,15,16-decahydrospiro[cyclopenta[a]phenanthrene-17,2'-oxiran]-3(2H)-one; (2'S,8R,9S,10R,13S,14S)-10,13-Dimethyl-1,8,9,10,11,12,13,14,15,16-decahydrospiro[cyclopenta[a]phenanthrene-17,2'-oxiran]-3(2H)-one;