l theanine and its Impurities

L Theanine is an amino acid found most commonly in tea leaves and in small amounts in Bay Bolete mushrooms. It is also known as L-γ-glutamylethylamide and N5-ethyl-L-glutamine, Reference standards of L Theanine API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.