Cyproterone Acetate EP Impurity B

Chemical Name: (2aR,3aS,3bS,3cS,5aS,6R,8aS,8bR)-6-acetyl-10-methoxy-3b,5a-dimethyl-2-oxo-2,2a,3,3a,3b,3c,4,5,5a,6,7,8,8a,8b-tetradecahydrocyclopenta[a]cyclopropa[g]phenanthren-6-yl acetate ; 6-methoxy-3,20-dioxo-1β,2β-dihydro-3′H-cyclopropa[1,2]pregna-1,4,6-trien-17-yl acetate,