10-Amino-4(S)-4-ethyl-4-hydroxy-1H-pyrano[3',4':6,7]indolizino[1,2-b]quinoline-3,14(4H,12H)-dione 9-Amino-20-(S)-camptothecin 9-NH2-Camptothecin 91421-43-1 AIDS-005220 AIDS005220 NSC603071