(2S)-2-[[[(2S)-2-acetamido-3-phenylpropanoyl]amino]carbamoylamino]-N,3-dimethylbutanamide
(2S)-2-[[[(2S)-2-acetamido-3-phenyl-propanoyl]amino]carbamoylamino]-N,3-dimethyl-butanamide
(2S)-2-[[[N'-[(2S)-2-acetamido-1-oxo-3-phenylpropyl]hydrazino]-oxomethyl]amino]-N,3-dimethylbutanamide
(2S)-2-[[[(2S)-2-acetamido-3-phenyl-propanoyl]amino]carbamoylamino]-N,3-dimethyl-butyramide