L-Theanine is one of the main free amino acid components in tea. Molecular Formular: C7H14N2O3 CAS 3081-61-6 L-TheanineMolecular Formular: C7H14N2O3CAS 3081-61-6Source: Miocrobe fermentQuality Standard:JP2000Chemical Name: N-gamma-ethyl-L-glutamine Theanine is one of the main free amino acid components in tea. The paper reviews the respects of nature, preparation, extraction and application. ...