Irinotecan EP Impurity A Sulfate salt

Chemical Name: (4S)-4-ethyl-4-hydroxy-3,14-dioxo-3,4,12,14-tetrahydro-1H-pyrano[3′,4′:6,7]indolizino[1,2-b]quinolin-9-yl 1,4′-bipiperidine-1′-carboxylate Sulfate salt (as per EP);(S)-4-Ethyl-4-hydroxy-1H-pyrano[3′,4′:6,7]indolizino[1,2-b]quin oline-3,14(4H,12H)-dione-9-yl (1,4′-bipiperidine)-1′-carboxylate Sulfate salt (as per USP)

Synonym: diethyl 2-(6-chloro-9H-carbazol-2-yl)-2-methylpropanedioate