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Eplerenone intermediate A1

Eplerenone intermediate A1 ??? ???

???(??):: Eplerenone intermediate A1;5-Cyano-11 alpha-hydroxy-3,5'-dioxo-4 beta,5',6,7 beta-tetrahydrocyclopenta[4,5,6,7]-5 beta,17 alpha-pregnane-21,17-carbolactone;4'S(4'α),7'α-hexadecahydro-11'α-hydroxy-10'β,13'beta-dimethyl-3',5,20'-trioxospiro[furan-2(3H),17'β-[4,7]metheno(17H)cyclopenta[a]phenanthrene]-5'β(2'H)-carbonitrile;(4'S,5'S,7'R,8'S,9'S,10'R,11'R,13'S,14'S,17'R)-Hexadecahydro-11'-hydroxy-10',13'-dimethyl-3',5,20'-trioxospiro[furan-2(3H),17'-[4,7]methano[17H]cyclopenta[a]phenanthrene]-5'(2'H)-carbonitrile;Spiro[furan-2(3H),17'-[4,7]methano[17H]cyclopenta[a]phenanthrene]-5'(2'H)-carbonitrile, hexadecahydro-11'-hydroxy-10',13'-dimethyl-3',5,20'-trioxo-, (4'S,5'S,7'R,8'S,9'S,10'R,11'R,13'S,14'S,17'R)-

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Eplerenone intermediate A1 ??

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Eplerenone EP Impurity A SC 25152 Eplerenone Impurity 14 (7β,11α,17α)-9,11-Epoxy-17-hydroxy-3-oxo-pregn-4-ene-7,21-dicarboxylic Acid γ-Lactone Methyl Ester Eplerenone Hydroxyacid Potassium Salt Eplerenone Impurity 3 6-B-HYDROXY EPLERENONE Eplerenone 7-Carboxylic Acid Impurity 21-Hydroxy Eplerenone Eplerenone EP Impurity B (7a,17a)-17-Hydroxy-3-oxo-pregna-4,9(11)-diene-7,21-dicarboxylicacid g-lactone methyl ester 11-alpha-Hydroxycarvenone Eplerenone 11-a-Hydroxy canrenone methyl ester 5,pregnane-7 alpha,21-dicarboxylic acid,17-ydroxy-11-methylsulfonic acid-3-ketone,-butyrolectone,methyl ester cas:(intermediate of eplerenone)