[(1R,2S)-2-Hydroxy-1-(4-methoxy-phenyl)-2-((S)-2-oxo-[1,3]dioxolan-4-yl)-ethyl]-carbamic acid tert-butyl ester

[(R)-1-(4-Methoxy-phenyl)-2-oxo-ethyl]-carbamic acid tert-butyl ester

[(R)-(Methoxy-methyl-carbamoyl)-(4-methoxy-phenyl)-methyl]-carbamic acid tert-butyl ester

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

[(R)-((2S,3R)-3-Hydroxymethyl-oxiranyl)-(4-methoxy-phenyl)-methyl]-carbamic acid tert-butyl ester