The artificial sweetener aspartame is the methyl ester of the dipeptide

The most popular and effective artificial sweetener is aspartame. It is approximately 100 times sweeter than cane sugar. It is a methyl ester of a dipeptide made of phenylalanine and aspartic acid. Because aspartame is unstable at cooking temperatures, its application is restricted to cold foods and soft drinks. Aspartame, Alitame, Saccharin, Sucralose, and others are examples of artificial sweeteners.