4-Hydroxy-3-methoxymethamphetamine (HMMA) is an
active metabolite An active metabolite is an active form of a drug after it has been processed by the body.
Metabolites of drugs
An active metabolite results when a drug is metabolized by the body into a modified form which continues to produce effects in the body ...
of
3,4-methylenedioxymethamphetamine (MDMA). It is a slightly more potent stimulant than MDMA.
References
Methamphetamines
Human drug metabolites
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