for the following products
(2S)-2-(N-tert-Butoxycarbonyl)amino-3-hydroxy-3-methylbutanoic acid | (S)-2-N-Boc-Amino-3-hydroxy-3-methylbutyric acid | Boc-beta,beta-diMe-L-Ser-OH | N-alpha-tert-Butyloxycarbonyl-beta,beta-dimethyl-L-serine and N-Boc-(S)-2-Amino-3-hydroxy-3-methylbutanoic acid
