1-Piperazineacetic acid, 4-(2-hydroxyethyl)-, 4-ethyl-3,4,12,14-tetrahydro-3,14-dioxo-1H-pyrano[3',4':6,7]indolizino[1,2-b]quinolin-4-yl ester, dihydrochloride, (S)- CAMPTOTHECIN,20-O-((4-(2-HYDROXYETHYL)-1-PIPERAZINO)OAC NSC374028