(S)-1-Benzyl-4-(2-p-tolyl-ethyl)-azetidine-2,3-dione

(S)-2-Benzylamino-3-(4-methoxy-phenyl)-propionic acid methyl ester

(3R,4S)-1-Benzyl-3-hydroxy-4-(2-p-tolyl-ethyl)-azetidin-2-one

(S)-3-Benzyl-4-((4S,5S)-2,2-dimethyl-5-phenyl-[1,3]dioxolan-4-yl)-oxazolidine-2,5-dione

(3R,4R,4'R)-4-<<<(1,1-Dimethylethyl)dimethylsilyl>oxy>phenylmethyl>-3-phenylmethoxy-1-(phenylmethyl)azetidin-2-one