Amide-containing amino acid
Anhydrous NH3 may replace alcohol from its combination with an amino acid in an amino acid ester so that an amide of amino acid and a molecule of free alcohol is produced. Asparagine is the amide formed from Aspaic acid.Ref: Textbook of medical biochemistry, MN Chatterji, 8th edition, page no: 80
Alanine
Leucine
Asparagine
Serine
Structure and function of protein