1-(3,4-Dihydroxyphenyl)-2-[(phenylmethyl)amino]-ethanone-d5 is an intermediate in the synthesis of (+)-Noradrenaline-d6 Bitartrate (N661027), which is a labeled analogue of (+)-Noradrenaline Bitartrate (N661025), an agonist at a1- and a2-adrenoreceptors.