UNC9994 hydrochloride is a functionally selective, β-arrestin–biased dopamine D 2 receptor ( D 2 R ) agonist that selectively activates β-arrestin recruitment and signaling. UNC9994 hydrochloride shows a binding affinity with a K i of 79 nM for D 2 R . UNC9994 hydrochloride is also an antagonist of G i -regulated cAMP production and partial agonist for D2R/β-arrestin-2 interactions. UNC9994 hydrochloride shows antipsychotic-like activity.