L-Glutamic acid-13C5 hydrate salt is the 13C labeled L-Glutamic acid hydrate salt. L-Glutamic acid monosodium hydrate is an excitatory amino acid neurotransmitter that acts as an agonist for all subtypes of glutamate receptors (metabolic rhodophylline, NMDA, and AMPA). L-Glutamic acid monosodium hydrate has an agonist effect on the release of DA from dopaminergic nerve endings. L-Glutamic acid monosodium hydrate can be used in the study of neurological diseases. L-Glutamic acid monosodium hydrate acts at ionotropic and?metabotropic glutamate receptors.