(2R,2'R,3S,3'S)-(2aR,4R,4aS,6R,9S,11S,12S,12aR,12bS)-12b-acetoxy-12-(benzoyloxy)-11-hydroxy-6-methoxy-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]oxete-4,9-diyl bis(3-((tert-butoxycarbonyl)amino)-2-hydroxy-3-phenylpropanoate); 4-(Acetyloxy)-7α,13α-bis[[(2R,3S)-3-[(tert-butoxycarbonyl)amino]-2-hydroxy-3-phenylpropanoyl]oxy]-1-hydroxy-10β-methoxy-9-oxo-5β,20-epoxytax-11-en-2α-yl benzoate (as per EP) ,(2R,2'R,3S,3'S)-(2aR,4R,4aS,6R,9S,11S,12S,12aR,12bS)-12b-acetoxy-12-(benzoyloxy)-11-hydroxy-6-methoxy-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]oxete-4,9-diyl bis(3-((tert-butoxycarbonyl)amino)-2-hydroxy-3-phenylpropanoate); 4-(Acetyloxy)-7α,13α-bis[[(2R,3S)-3-[(tert-butoxycarbonyl)amino]-2-hydroxy-3-phenylpropanoyl]oxy]-1-hydroxy-10β-methoxy-9-oxo-5β,20-epoxytax-11-en-2α-yl benzoate (as per EP) ,,Cabazitaxel Impurity