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