Cabazitaxel Impurity 4

Chemical Name: (2aR,4S,4aS,6R,9S,11S,12S,12aR,12bS)-12b-Acetoxy-9-(((2R,3S)-3-((tert-butoxycarbonyl)amino)-2-hydroxy-3-phenylpropanoyl)oxy)-11-hydroxy-4,6-dimethoxy-4a,8,13,13-tetramethyl-5-oxo-2a,3,4,4a,5,6,9,10,11,12,12a,12b-dodecahydro-1H-7,11-methanocyclodeca[3,4]benzo[1,2-b]oxet-12-yl (E)-2-methylbut-2-enoate

Smile: O[C@@H](C(O[C@H]1C[C@]([C@@H](OC(/C(C)=C/C)=O)[C@@]([C@@]2(OC(C)=O)[C@H](OC2)C[C@@H]3OC)([H])[C@]3(C)C([C@@H]4OC)=O)(O)C(C)(C)C4=C1C)=O)[C@@H](NC(OC(C)(C)C)=O)C5=CC=CC=C5