4-Fluoro-2,5-dimethoxy-N-[(2-methoxyphenyl)methyl]benzeneethanamine-D3 hydrochloride is a labelled analogue of 4-Fluoro-2,5-dimethoxy-N-[(2-methoxyphenyl)methyl]benzeneethanamine hydrochloride (F591180). 4-Fluoro-2,5-dimethoxy-N-[(2-methoxyphenyl)methyl]benzeneethanamine hydrochloride is a compound that has antagonist acitvity towards the 5-hydroxytryptamine 2A receptor, a protein complex that is found in the central and peripheral nervous system.