2231666-58-1

(1R,9S)-Exatecan impurity of exatecan (1R,9S)-1-Amino-9-ethyl-5-fluoro-9-hydroxy-4-methyl-2,3,12,15-tetrahydrobenzo[de]pyrano[3’,4’:6,7]indolizino[1,2-b]quinoline-10,13(1H,9H)-dione Mesylate (1R,9S)-1-amino-9-ethyl-5-fluoro-9-hydroxy-4-methyl-1,2,3,9,12,15-hexahydro-10H,13H-benzo[de]pyrano[3',4':6,7]indolizino[1,2-b]quinoline-10,13-dione methanesulfonate (10S,23R)-23-amino-10-ethyl-18-fluoro-10-hydroxy-19-methyl-8-oxa-4,15-diazahexacyclo[14.7.1.02,1?.0?,13.0?,11.02?,2?]tetracosa-1,6(11),12,14,16,18,20(24)-heptaene-5,9-dione