| Synonyms: | Eplerenone EP Impurity B;Pregn-4-ene-7,21-dicarboxylic acid, 11,12-epoxy-17-hydroxy-3-oxo-, 21,17-lactone, 7-methyl ester, (7α,11α,12α,17α)-;(7α,11α,12α,17α)-11,12-Epoxy-17-hydroxy-3-oxo-pregn-4-ene-7,21-dicarboxylic Acid Lactone, Methyl Ester;Eplerenone Impurity 4(Eplerenone EP Impurity B);Eplerenone Impurity B;(1R,3aS,3bS,4R,9aR,9bS,9cS,10aR,10bR)-Methyl 9a,10b-dimethyl-5',7-dioxo-2,3,3a,3b,4,4',5,5',7,8,9,9a,9b,9c,10a,10b-hexadecahydro-3'H-spiro[cyclopenta[1,2]phenanthro[3,4-b]oxirene-1,2'-furan]-4-carboxylate (Eplerenone Impurity);11alpha,12alpha-Epoxy-7alpha-(methoxycarbonyl)-3-oxo-17alpha-pregn-4-ene-21,17-carbolactone;(1R,3aS,3bS,4R,9aR,9bS,9cS,10aR,10bR)-Methyl 9a,10b-dimethyl-5',7-dioxo-2,3,3a,3b,4,4',5,5',7,8,9,9a,9b,9c,10a,10b-hexadecahydro-3'H-spiro[cyclopenta[1,2]phenanthro[3,4-b]oxirene-1,2'-furan]-4-carboxylate (Eplerenone Impurity) |