(S)-2-tert-Butoxycarbonylamino-3,3-dimethylbutyric AcidN-tert-Butoxycarbonyl-L-tert-butylglycineN-tert-Butoxycarbonyl-L-tert-leucine(2S)-2-(tert-Butoxycarbonylamino)-3,3-dimethylbutanoic AcidN-Boc-L-tert-leucine(S)-2-(((tert-Butoxy)carbonyl)amino)-3,3-dimethylbutanoic Acid