(S)-2-({1-[5-((S)-1-t-Butoxycarbonyl-2-phenyl-ethylcarbamoyl)-1H-imidazol-4-yl]-methanoyl}-amino)-3-phenyl-propionic acid t-butyl ester 1H-Imidazole-4,5-dicarbaldehyde bis[L-phenylalanine-t-butyl ester AIDS-087844 AIDS087844