Theanine n is an amino acid analog of the proteinogenic amino acids L-glutamic acid and L-glutamine and is found primarily in particular plant and fungal species. It is also known as N5-ethyl-L-glutamine, and by a variety of other synonyms (see box). It was discovered as a constituent of a green tea in 1949; in 1950 it was isolated from gyokuro le...
unique amino acid in tea.
An amino acid unique to tea.