for the following products
(R)-3-(tert-Butoxycarbonylamino)-4-phenylbutanoic acid | b-[[(1,1-dimethylethoxy)carbonyl]amino]-,(br)-benzenebutanoic acid | Boc-(R)-3-Amino-4-phenylbutyric acid | Boc-D-beta-HoPhe-OH | N-beta-(tert-Butyloxycarbonyl)-D-homophenylalanine and Boc-D-beta-Homophenylalanine
