IUPAC Name
(2'S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,8dR,9aR)-4a,6a-dimethyl-4,4a,4b,4',5,5',6,6a,7a,8,8a,8b,8c,8d,9,9a-hexadecahydro-3'H-spiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-7,2'-furan]-2(3H)-one
References
"Muhn; P,; et al,: Contraception; 51; 99 (1995); Oelkers; W,; et al,: Mol, Cell, Endocrinol,; 217; 255 (2004)"