<unk>  (or γ-Hydroxybutyric<unk>  <unk> , also known as 4-hydroxybutanoic<unk>  is a naturally occurring neurotransmitter and a psychoactive drug. It is a precursor to GABA, glutamate, and glycine in certain brain areas. It acts on the<unk>  receptor and is a weak agonist at the GABAB receptor.<unk>  has been used in the medical setting as a general anesthetic and as treatment for cataplexy, narcolepsy, and alcoholism. It is also used illegally as an intoxicant, as an athletic-performance enhancer, as a date-rape drug, and as a recreational drug. It is commonly used in the form of a salt, such as sodium γ-hydroxybutyrate (NaGHB, sodium oxybate, or Xyrem) or potassium γ-hydroxybutyrate (KGHB, potassium oxybate).<unk>  is also produced as a result of fermentation, and is found in small quantities in some beers and wines, beef and small citrus fruits. Succinic semialdehyde dehydrogenase deficiency is a disease that causes<unk>  to accumulate in the blood.
Gamma-Hydroxybutyric acid
Gamma-Amino-beta-hydroxybutyric acid
Choline
Beta-Hydroxy beta-methylbutyric acid
Phenylacetic acid
Butyric acid
Arachidonic acid
Glutamate 