rac-4-Fluoro-α-(4-methoxyphenyl)benzeneethanamine Hydrochloride-d3 is the isotope labelled analog of rac-4-Fluoro-α-(4-methoxyphenyl)benzeneethanamine Hydrochloride (F593405); a reagent in the synthesis of N-[3-(2-aralkylamino-1-hydroxyethyl)phenyl]methanesulfonamides and its analogs as β3 adrenoceptor agonists.