4-(Methoxy-d3)-α-methyl-(αS)-benzeneethanamine Hydrochloride is the labelled form of 4-Methoxyamphetamine Hydrochloride (M261015), which is the HCl salt of 4-Methoxyamphetamine. 4-Methoxyamphetamine is a designer drug belonging to the amphetamine class and releases 5-hydroxytryptamine in brain tissue.