L-Pyroglutamic acid is an amino acid that is used in the synthesis of peptides. It has also been observed to convert when placed at the N-terminus in vivo to create IgG2 antibodies. Synonyms: (-)-2-Pyrrolidone-5-carboxylic Acid; (-)-Pyroglutamic Acid; (2S)-5-Oxopyrrolidine-2-carboxylic Acid; (5S)-2-Oxopyrrolidine-5-carboxylic Acid; (S)-(-)-2-Pyrrolidone-5-carboxylic Acid; (S)-(-)-γ-Butyrolactam-γ-carboxylic Acid; (S)-2-Pyrrolidone-5-carboxylic Acid; (S)-5-Oxo-2-pyrrolidinecarboxylic Acid; (S)-5-Oxoproline; (S)-Pyroglutamic Acid; 2-L-Pyrrolidone-5-carboxylic Acid; 2-Oxopyrrolidine-5(S)-carboxylic Acid; 2-Pyrrolidinone-5-carboxylic Acid; 5-Carboxy-2-pyrrolidinone; 5-Oxo-L-proline; 5-Oxoproline; 5-Pyrrolidinone-2-carboxylic Acid; Ajidew A 100; Glutimic Acid; Glutiminic Acid; L-(-)-Pyroglutamic Acid; L-2-Pyrrolidone-5-carboxylic Acid; L-5-Carboxy-2-pyrrolidinone; L-5-Oxo-2-pyrrolidinecarboxylic Acid; L-5-Oxoproline; γ-Lactam L-Glutamic Acid, ; L-Glutimic Acid; L-Glutimini