3-Chloropropanoic acid (also 3-chloropropionic acid) or UMB66 is a drug used in scientific research. It is structurally related to GHB and binds to the GHB receptor, but has no affinity for GABA receptors. It is also an active ingredient in some herbicide blends. Overdose may cause unconsciousness and/or convulsions.
^Macias, A. T.; Hernandez, R. J.; Mehta, A. K.; MacKerell, A. D. Jr; Ticku, M. K.; Coop, A. (2004). "3-Chloropropanoic acid (UMB66): A ligand for the gamma-hydroxybutyric acid receptor lacking a 4-hydroxyl group". Bioorganic & Medicinal Chemistry12 (7): 1643–1647. doi:10.1016/j.bmc.2004.01.025. PMID15028257.