(R)-2-((S)-2-((tert-butoxycarbonyl)amino)-N-methyl propanamido)-3-(1H-indol-3-yl)propanoic acid

methyl (2S,3S)-3-amino-3-(4-carbamoylphenyl)-2-methoxypropanoate

(2S,3R)-methyl 3-(4-cyanophenyl)-2,3-dihydroxypropanoate

(2S,3S)-methyl 3-azido-3-(4-cyanophenyl)-2-hydroxypropanoate

methyl (2S,3S)-3-azido-3-(4-cyanophenyl)-2-methoxypropanoate