Cariprazine-d8-1 (RGH-188-d8-1) is the deuterium labeled Cariprazine (HY-14763). Cariprazine is a novel antipsychotic agent candidate that exhibits high affinity for the D3 (Ki=0.085 nM) and D2 (Ki=0.49 nM) receptors, and moderate affinity for the 5-HT1A receptor (Ki=2.6 nM).