for the following products
(2S,3R)-2-(Tert-butoxycarbonylamino)-3-methoxybutanoic acid | Boc-(2S,3S)-2-amino-3-methoxybutanoic acid | Boc-L-Thr(Me)-OH | Boc-Thr(Me)-OH | N-alpha-tert-Butyloxycarbonyl-O-methyl-L-threonine | N-tert-Butyloxycarbonyl-o-methyl-L-threonine and Boc-O-Methyl-L-threonine
