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Benzyl ((s)-2-((tert-butoxycarbonyl)amino)-4-phenylbutanoyl)-l-leucyl-l-phenylalaninate

(S)-methyl 2-((s)-2-((tert-butoxycarbonyl)amino)-4-methylpentanamido)-3-phenylpropanoate

(S)-tert-butyl (2,6-dimethyl-3-oxohept-1-en-4-yl)carbamate