methyl ester aspartame Codex::951 A dipeptide obtained by formal condensation of the α-carboxy group of <small>L</small>-aspartic acid with the amino group of methyl <small>L</small>-phenylalaninate. Commonly used as an artificial sweetener. Europe::951 LanguaL term definition: Food additive; technological purpose(s): flavour enhancer, sweetener. carboxylic acid dipeptide