(1S-(1 alpha,2 alpha,6 alpha,7 alpha,8 alpha,9 beta,10 alpha,13 alpha,14 beta,17 alpha))-21,21-difluoro-2,4',5',6,7,8,9,10,11,12,13,14,15,16,20,21-hexadecahydro-10,13-dimethylspiro(17H-dicyclopropa(1,2:6,7)cyclopenta(a)phenanthrene-17,2'(3'H)-furan)-3(1H)-one