10H-1,3-Dioxolo[4,5-g]pyrano[3',4':6,7]indolizino[1,2-b]quinoline-8,11(7H,13H)-dione, 14-(chloromethyl)-7-ethyl-7-hydroxy-, (7S)- 7-Chloromethyl-10,11-methylenedioxy-20(S)-CPT AIDS-058627 AIDS058627 Camptothecin analog NSC67901