N-Carboxy-L-Alanine N-tert-Butyl Ester; (2S)-2-[(tert-Butoxycarbonyl)amino]propanoic Acid; (2S)-2-tert-Butoxycarbonylaminopropanoic Acid; (S)-2-(N-tert-Butoxycarbonyl)aminopropionic Acid; (S)-2-[(tert-Butoxycarbonyl)amino]propanoic Acid;