(R)-2-(2-Aminoacetylamino)-3-phenylpropionic acid

(S)-4-Amino-2-(2-aminoacetamido)-4-oxobutanoic acid

N5-((S)-4-Amino-1-carboxy-4-oxobutyl)-L-glutamine

(S)-2-Amino-5-(((S)-1-((carboxymethyl)amino)-3-methyl-1-oxobutan-2-yl)amino)-5-oxopentanoic acid

(S)-2-(2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-4-(tert-butoxy)-N-(2,4-dimethoxybenzyl)-4-oxobutanamido)acetic acid

(S)-2-((S)-2-Amino-3-carboxypropanamido)-4-methylpentanoic acid

(S)-2-((S)-2-((tert-Butoxycarbonyl)amino)-3-methylbutanamido)propanoic acid

(S)-3-Amino-4-((carboxymethyl)amino)-4-oxobutanoic acid

(S)-2-((S)-2-Amino-3-carboxypropanamido)succinic acid

(S)-2-((S)-2-Aminopropanamido)-3-methylbutanoic acid