1H-Pyrano(3',4':6,7)indolizino(1,2-b)quinoline-3,14(4H,12H)-dione-, 4-ethyl-4-hydroxy-10-methoxy-, (S)- 39026-92-1 9-Methoxycamptothecin 9-Methoxycamptothecine Camptothecin, 9-methoxy- NSC 176323