metaphedrine metaphedrine 3-methylmethamphetamine (3-mma) or metaphedrine is an amphetamine derivative which has been sold as a designer drug, first being reported in sweden in 2021. metaphedrinelegal statuslegal status us: schedule i (isomer of etilamfetamime) identifiers iupac name n-methyl-1-(3-methylphenyl)propan-2-amine cas number861007-68-3pubchem cid24257262chemical and physical dataformulac11h17nmolar mass163.264 g·mol−13d model (jsmol)interactive image smiles cc1=cc(=cc=c1)cc(c)nc inchi inchi=1s/c11h17n/c1-9-5-4-6-11(7-9)8-10(2)12-3/h4-7,10,12h,8h2,1-3h3key:cxvnkbvjdkmloh-uhfffaoysa-n