(4S,5S)-3-(tert-butoxycarbonyl)-2-(4-methoxyphenyl)-4-phenyloxazolidine-5-carboxylic acid; Cabazitaxel Impurity 20; (4S,5S)-2-(4-Methoxyphenyl)-4-phenyl-3-(1,1-dimethylethyl)ester-3,5-Oxazolidinedicarboxylic Acid
(4S,5S)-3-(tert-butoxycarbonyl)-2-(4-methoxyphenyl)-4-phenyloxazolidine-5-carboxylic acid; Cabazitaxel Impurity 20; (4S,5S)-2-(4-Methoxyphenyl)-4-phenyl-3-(1,1-dimethylethyl)ester-3,5-Oxazolidinedicarboxylic Acid