20',20'-difluoro-3',4'-dihydrovinorelbine InChI=1/C45H54F2N4O8/c1-8-42-14-11-16-51-17-15-43(36(42)51)30-19-31(34(56-5)20-33(30)49(4)37(43)45(55,40(54)58-7)38(42)59-25(2)52)44(39(53)57-6)21-26-18-27(41(3,46)47)23-50(22-26)24-29-28-12-9-10-13-32(28)48-35(29)44/h9-14,19-20,26-27,36-38,48,55H,8,15- aspidospermidine-3-carboxylic acid, 4-(acetyloxy)-6,7-didehydro-15-[(6R,8S)-4-(1,1-difluoroethyl)-1,3,4,5,6,7,8,9-octahydro-8-(methoxycarbonyl)-2,6-methano-2H-azecino[4,3-b]indol-8-yl]-3-hydroxy-16-me methyl rel-(2beta,3beta,4beta,5alpha,12beta,19alpha)-4-(acetyloxy)-15-[(6R,8S)-4-(1,1-difluoroethyl)-8-(methoxycarbonyl)-1,3,4,5,6,7,8,9-octahydro-2,6-methanoazecino[4,3-b]indol-8-yl]-3-hydroxy-16-met vinflunine