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 CAMPTOTHECIN,9-METHOXY Camptothecin, 9-methoxy- NSC176323