(Z)-(S)-4-tert-Butoxycarbonylamino-4-(4-methoxy-phenyl)-but-2-enoic acid methyl ester

[(Z)-(S)-4-Hydroxy-1-(4-methoxy-phenyl)-but-2-enyl]-carbamic acid tert-butyl ester

[(E)-(S)-4-Hydroxy-1-(4-methoxy-phenyl)-but-2-enyl]-carbamic acid tert-butyl ester

(2S,3R,4R)-3,4,5-Triacetoxy-2-tert-butoxycarbonylamino-pentanoic acid tert-butyl ester

Acetic acid (1R,2R)-2,3-diacetoxy-1-[(R)-tert-butoxycarbonylamino-(4-methoxy-phenyl)-methyl]-propyl ester