Vincristine Sulfate EP Impurity B

Chemical Name: Methyl (3aR,4R,5S,5aR,10bR,13aR)-4-(acetyloxy)-3a-ethyl-9-[(5R,7S,9S)-5-ethyl-9-(methoxycarbonyl)-1,4,5,6,7,8,9,10-octahydro-2H-3,7-methanoazacycloundecino[5,4-b]indol-9-yl]-6-formyl-5-hydroxy-8-methoxy-3a,4,5,5a,6,11,12,13a-octahydro-1H-indolizino[8,1-cd]carbazole-5-carboxylate (as per EP)

Smile: [H][C@@]([C@@]12[C@@]3([H])N4CC2)([C@](C(OC)=O)(O)[C@@](OC(C)=O)([H])[C@]3(CC)C=CC4)N(C([H])=O)C5=C1C=C([C@@](C(OC)=O)(C[C@]6([H])C[C@@]([H])(CC)CN(CC7)C6)C8=C7C(C=CC=C9)=C9N8)C(OC)=C5