(2S)-2-[[(2S)-2-acetamido-3-phenylpropanoyl]amino]-6-hydrazinylheptanedioic acid
(2S)-2-[[(2S)-2-acetamido-3-phenyl-propanoyl]amino]-6-hydrazino-heptanedioic acid
(2S)-2-[[(2S)-2-acetamido-1-oxo-3-phenylpropyl]amino]-6-hydrazinoheptanedioic acid
(2S)-2-[[(2S)-2-acetamido-3-phenyl-propanoyl]amino]-6-hydrazino-pimelic acid
(2S)-2-[[(2S)-2-acetamido-3-phenyl-propanoyl]amino]-6-hydrazinyl-heptanedioic acid