Dopamine-d5 (hydrochloride) is the deuterium labeled Dopamine (hydrochloride). Dopamine hydrochloride (ASL279) is a catecholamine neurotransmitter that is produced in the substantia nigra, ventral tegmental area, and hypothalamus of the brain. Dopamine hydrochloride (ASL279) plays several important roles in the brain and body[1]. Dopamine hydrochloride (ASL279) acts through D2 dopamine receptors to induce endocytosis of VEGFR2, which is critical for promoting angiogenesis[1].