phenylalanylglutamate

(2S)-2-[[(2S)-2-amino-3-phenyl-propanoyl]amino]glutaric acid

(2S)-2-[[(2S)-2-amino-3-phenylpropanoyl]amino]pentanedioic acid

(2S)-2-[[(2S)-2-azanyl-3-phenyl-propanoyl]amino]pentanedioic acid