N-[(2E)-4-oxo-4-phenylbut-2-enoyl]-L-leucine

N-[(2S)-2-(benzylamino)-4-oxo-4-phenylbutanoyl]-L-leucine

N-[(2S)-2-amino-4-phenylbutanoyl]-L-leucine

n-butyryl-L-tyrosyl-L-leucyl-L-tyrosynol

L-缬氨酸