(7?,17?)-7-(Acetylthio)-17-hydroxy-3-oxo-pregna-4,20-diene-21-carboxylic Acid ?-Lactone;spiro[17H-cyclopenta[a]phenanthrene-17,2'(5'H)-furan] Pregna-4,20-diene-21-carboxylic Acid Deriv.; Spironolactone EP Impurity A; 20,21-Dehydro Spironolactone
(7?,17?)-7-(Acetylthio)-17-hydroxy-3-oxo-pregna-4,20-diene-21-carboxylic Acid ?-Lactone;spiro[17H-cyclopenta[a]phenanthrene-17,2'(5'H)-furan] Pregna-4,20-diene-21-carboxylic Acid Deriv.; Spironolactone EP Impurity A; 20,21-Dehydro Spironolactone