1H-Pyrano(3',4':6,7)indolizino(1,2-b)quinoline-3,14(4H,12H)-dione, 4-ethyl-4-hydroxy-, (S)- 20(S)-Camptothecine 21,22-Secocamptothecin-21-oic acid lactone 7689-03-4 AI3-62475 BRN 0631069 CCRIS 8162 Camptothecin Camptothecine Camptothecine (8CI) NSC 100880 NSC 94600