SEARCH Articles Figures Tables Aspartyl-L-Phenylalanine Methyl Ester D-phenylalanine Esters aspartyl L Phenylalanine L-Aspartyl-D-phenylalanine methyl L-Phenylalanine methyl ester Methyl L-phenylalaninate Methyl phenylalaninate Phenylalanine ester Phenylalanine methyl ester