Synonyms: Pregn-4-ene-7,21-dicarboxylic acid,9,11-epoxy-17-hydroxy-3-oxo-,?- lactone,methyl ester,(7R,11R,17R)-;9,11alpha-Epoxy-17-hydroxy-3-oxo-17alpha-pregn-4-ene-7alpha,21-dicarboxylic acid, gamma-lactone, methyl ester;Cgp 30083;Epoxymexrenone;SC-66110;Inspra;Pregn-4-ene-7,21-dicarboxylic acid, 9,11-epoxy-17-hydroxy-3-oxo-, gamma-lactone, methyl ester, (7alpha,11alpha,17alpha)-;Eplerenone(& the intermediates);Inspra (TN);Pregn-4-ene-7,21-dicarboxylic acid,9,11-epoxy-17-hydroxy-3-oxo-γ,-lactone,methyl ester,(7a,11a,17a);Pregn-4-ene-7,21-dicarboxylic acid,9,11-epoxy-17-hydroxy-3-oxo-,?- lactone,methyl ester,(7R,11R,17R)-;