for the following products
(2R,3R)-Boc-beta-methyl-phenylalanine | (2R,3R)-N-alpha-tert-Butyloxycarbonyl-c-beta-methyl-L-phenylalanine | (2R,3R)/(2S, 3S)-racemic-Boc-beta-methyl-phenylalanine | Boc-beta-Me-D-Phe-OH (2R,3R) and N-Boc-Erythro-D-beta-methylphenylalanine
