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(2R,3S)-3-(tert-Butoxy)-2-(4-ethyl-2,3-dioxopiperazine-1-carboxamido)butanoic acid
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(S)-2-(3-Acetamidopropanamido)-3-(1H-imidazol-4-yl)propanoic acid
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(S)-2-(2-Aminoacetamido)-3-(1H-imidazol-4-yl)propanoic acid
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(2S,4R)-1-Glycyl-4-hydroxypyrrolidine-2-carboxylic acid