tert-butyl (2S)-3-hydroxy-2-(phenylmethoxycarbonylamino)propanoate

methyl 3-hydroxy-2-[[3-hydroxy-2-(phenylmethoxycarbonylamino)propanoyl]amino]propanoate

(S)-N-benzyl 2-N-(benzyloxycarbonyl)amino-3-hydroxypropionamide