(2S,4E,6S)-2,4,6-Trimethyl-7-oxo-7-[(4S)-2-oxo-4-(phenylmethyl)-3-oxazolidinyl]-4-heptenoic Acid Ethyl Ester is an intermediate in the synthesis of substituents used in the preparation of Jasplakinolide (J210700), an potent inhibitor of prostrate and breast carcinoma cell proliferation.