3-MMC, or 3-Methylmethcathinone, is a molecule of the substituted cathinone class. Cathinones are a subcategory of amphetamines, sharing the core amphetamine structure of a phenyl ring bound to an amino (NH2) group through an ethyl chain and an additional methyl substitution at Rα.

3-MMC and other cathinone are differentiated by their ketone substitution on the beta carbon of the amphetamine skeleton, meaning they are B-keto-amphetamines. You can also check for the 3MMC powder through various online sites.

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3-MMC has two methyl substitutions on its cathinone skeleton, one at R3 of the phenyl ring, and a second at the nitrogen group RN.

3-MMC is analogous to mephedrone; it is identical in structure except for the placement of the methyl group at R3 instead of R4.

Pharmacology

Due to the lack of research regarding the substance, all discussion regarding its pharmacology is purely speculation based upon its structure and subjective effect similarities to other stimulants such as mephedrone, amphetamine, and 2-FMA. 

3-MMC most likely acts as both a dopamine and norepinephrine releasing agent. This means it may effectively boost the levels of the norepinephrine and dopamine neurotransmitters in the brain by binding to and partially blocking the transporter proteins that normally remove those monoamines from the synaptic cleft. 

This allows dopamine and norepinephrine to accumulate within the brain, resulting in stimulating and euphoric effects.