4-Hydroxy-3-methoxyamphetamine
4-Hydroxy-3-methoxyamphetamine (HMA), also known as 3-O-methyl-α-methyldopamine, is an active metabolite of 3,4-methylenedioxymethamphetamine (MDMA). It is substantially less potent than MDMA or 3,4-methylenedioxyamphetamine (MDA) as a monoamine releasing agent in vitro.
Source: Wikipedia — 4-Hydroxy-3-methoxyamphetamine (CC BY-SA 4.0)