Camptothecin-20-O-(N,N-dimethyl)glycinate HCl Glycine, N,N-dimethyl-, 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)- NSC618939