Spironolactone EP Impurity D

Chemical Name: S-[(2′R)-3,5′-dioxo-3′,4′-dihydro-5′H-spiro[androst-4-ene-17,2′-furan]-7α-yl] ethane(dithioperoxate) (as per EP) (2′R)-7α-(Acetyldisulfanyl)-3′,4′-dihydro-5′H-spiro[androst-4-ene-17,2′-furan]-3,5′-dione (as per USP)