(4R,5S)-3-tert-Butyl 5-methyl 2,2-dimethyl-4-phenyloxazolidine-3,5-dicarboxylate is an intermediate for the synthesis of (4R,5S)-2,2-Dimethyl-4-phenyl-3,5-oxazolidinedicarboxylic Acid 3-(1,1-Dimethylethyl) Ester (O846295), which is a reagent for preparing 1,8-naphthyridine-3-carboxamide derivatives with anticancer and anti-inflammatory activities. It can also be used to synthesize taxol derivatives for medical applications.