(3aR,3bS,5aS,6S,8aS,8bR)-1,1-difluoro-3a,5a-dimethyl-1,1a,2,3,3a,3b,4,5,5a,6,7,8,8a,8b,9,10b-hexadecahydrocyclopenta[a]cyclopropa[i]phenanthren-6-yl acetate