Docetaxel Impurity 18

Chemical Name: (2aR,4S,4aR,6R,9S,11S,12R,12aR,12bS)-12b-acetoxy-9-(((2R,3S)-3-((tert-butoxycarbonyl)amino)-2-hydroxy-3-phenylpropanoyl)oxy)-4,6,11-trihydroxy-4a-(hydroxymethyl)-8,13,13-trimethyl-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 benzoate

Synonym: methyl (E)-1-(2-chloroacetyl)-3-(methoxy(phenyl)methylene)-2-oxoindoline-6-carboxylate