CPT 11 Camptosar Camptothecin 11 Irinotecan NSC616348 [1,4'-Bipiperidine]-1'-carboxylic acid, 4,11-diethyl-3,4,12, 14-tetrahydro-4-hydroxy-3,14-dioxo-1H-pyrano[3',4':6,7] indolizino[1,2-b]quinolin-9-yl ester, monohydrochloride (S)-