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(also known as "3,4-methylenedioxy-N-methylcathinone", "MDMC", "βk-" and by the slang term "M1") is an empathogen and stimulant psychoactive drug. It is a member of the substituted amtamine, substituted and substituted methylenedioxynethylamine classes.

is the substituted analog of and the 3,4-methylenedioxy analog of . The only structural difference of with respect to is the substitution of 2 hydrogen atoms by 1 oxygen atom in the β position of the nethylamine core, forming a ketone group.[2]

was first synthesized by the chemists Peyton Jacob III and Alexander Shulgin in 1996 for potential use as an antidepressant.[3] Starting around 2004, has been sold for recreational use, taking advantage of the absence of legal prohibition of this compound in many countries.