(2S)-2-(methoxycarbonylamino)-3,3-dimethylbutanoic acid; (2S)-2-((Methoxyformamido)-3,3-dimethylbutanoic Acid; (S)-2-[(Methoxycarbonyl)amino]-3,3-dimethylbutanoic acid; N-(Methoxycarbonyl)-3-methyl-L-valine;Methyl Carbonyl L-tert Leucine