Pimozide-d5 (R6238-d5) is the deuterium labeled Pimozide (HY-12987). Pimozide is a dopamine receptor antagonist, with Kis of 1.4 nM, 2.5 nM and 588 nM for dopamine D2, D3 and D1 receptors, respectively, and also has affinity at alpha1-adrenoceptor, with a Ki of 39 nM, Pimozide also inhibits STAT3 and STAT5.