3'H-Cyclopropa(15,16)pregna-4,15-diene-7,21-dicarboxylic acid, 15,16-dihydro-17-hydroxy-3-oxo-, gamma-lactone, methyl ester, (7alpha,15alpha,16alpha,17alpha)- 7alpha-Methoxycarbonyl-15beta,16beta-methylene-3-oxo-17alpha-pregn-4-ene-21,17-carbolactone 84542-26-7 ZK 91587