(1S,9S)-1-amino-9-ethyl-5-fluoro-9-hydroxy-4-(hydroxymethyl)-1,2,3,9,12,15-hexahydro-10H,13H-benzo[de]pyrano[3',4':6,7]indolizino[1,2-b]quinoline-10,13-dione,(1S,9S)-1-amino-9-ethyl-5-fluoro-9-hydroxy-4-(hydroxymethyl)-1,2,3,9,12,15-hexahydro-10H,13H-benzo[de]pyrano[3',4':6,7]indolizino[1,2-b]quinoline-10,13-dione,Exatecan