methyl (2S,3R)-3-(benzyloxycarbonyl-N-methylamino)-2-hydroxybutyrate

(2R,3R)-2-tert-Butoxycarbonylamino-3-methylamino-butyric acid methyl ester

(2R,3R)-2-tert-Butoxycarbonylamino-3-[(9H-fluoren-9-ylmethoxycarbonyl)-methyl-amino]-butyric acid methyl ester

(2S,3R)-3-(Benzyloxycarbonyl-methyl-amino)-2-methanesulfonyloxy-butyric acid methyl ester

(2S,3R)-N-(9-fluorenylmethoxycarbonyl)-β-methylphenylalanine