(2′R)-7α-(Acetylsulfanyl)-3′,4′-dihydro-5′H-spiro[androst-4-ene-17,2′-furan]-3,5′-dione ; (7α,17α)-7-(Acetylthio)-17-hydroxy-3-oxo-pregn-4-ene-21-carboxylic acid γ-lactone ; CAS # 52-01-7 ;

Spironolactone BP Impurity�A ; Spironolactone USP RC B ; Δ20-Spironolactone ; (2′R)-7α-(Acetylsulfanyl)-5′H-spiro[androst-4-ene-17,2′-furan]-3,5′-dione ; CAS # 132458-33-4 ;

Spironolactone BP Impurity�B ; 4-Bromospironolactone ; (2′R)-7α-(Acetylsulfanyl)-4-bromo-3′,4′-dihydro-5′H-spiro[androst-4-ene-17,2′-furan]-3,5′-dione ;

Spironolactone BP Impurity C ; Spironolactone USP RC C ; (2′R)-3′,4′-Dihydro-5′H-spiro[androst-4-ene-17,2′-furan]3,5′-dione ; CAS # 976-70-5 ;

Spironolactone BP Impurity�D ; Spironolactone USP RC D ; Disulfanyl Spironolactone ; (2′R)-7α-(Acetyldisulfanyl)-3′,4′-dihydro-5′H-spiro[androst-4-ene-17,2′-furan]-3,5′-dione ;

Spironolactone BP Impurity�E ; 7β-Spironolactone ; (2′R)-7β-(Acetylsulfanyl)-3′,4′-dihydro-5′H-spiro[androst4-ene-17,2′-furan]-3,5′-dione ; CAS # 33784-05-3 ;

Spironolactone BP Impurity�F ; Spironolactone USP RC A ; Canrenone ; (2′R)-3′,4′-Dihydro-5′H-spiro[androst-4,6-diene-17,2′-furan]-3,5′-dione ; CAS # 976-71-6 ;

Spironolactone BP Impurity�G ; 6β-Hydroxy Spironolactone ; (2′R)-7α-(Acetylsulfanyl)-6β-hydroxy-3′,4′-dihydro-5′H-spiro[androst-4-ene-17,2′-furan]-3,5′-dione ;

Spironolactone BP Impurity�H ; (2′S)-Spiro[androst-4,6-diene-17,2′-oxiran]-3-one ;

Spironolactone BP Impurity I ; Spironolactone USP RC I ; S-[17α-(Ethoxymethyl)-17-hydroxy-3-oxoandrost-4-en-7α-yl] ethanethioate ;