1-Pyrrolidineacetic acid, 4-ethyl-3,4,12,14-tetrahydro-3,14-dioxo-1H-pyrano[3',4':6,7]indolizino[1,2-b]quinolin-4-yl ester, monohydrochloride, (S)- CAMPTOTHECIN, 20-O-(1-PYRROLIDINO)ACETYL-HCL NSC374027