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4-MPD, a stimulant drug also commonly known under the names 4-Methylpentedrone and 4-Methyl-α-methylamino-valerophenone, is of the cathinone class. These types of drugs feature a phenethylamine core with an alkyl group attached to the alpha carbon, as well as a ketone group attached to the beta carbon. Cathinone occurs naturally in the plant khat, the leaves of which are often chewed as a recreational drug. 4-MPD specifically is structurally similar to methcathinone, which serves as a controlled substance in the United States as well as in other countries.