4-Hydroxy-4-methylpentanoic acid HOCPCA 3-Chloropropanoic acid T-HCA NCS-382 2-Furanone Gamma-Hydroxybutyraldehyde Gabazine GHB receptor Monastrol Levosulpiride Sultopride Aceburic acid Gamma-Hydroxyvaleric acid Sulpiride Γ-Valerolactone 1,4-Butanediol Gallocatechol GABA analogue Gamma-Butyrolactone Sodium oxybate Gamma-Hydroxybutyric acid Amisulpride Prochlorperazine