4-EMC is a l stimulant frequently seen used as a recreational drug. It is extremely similar in nature to 4-MEC, being its structural isomer.
4-EMC is the short form of its full name, 4-Ethylmethcathinone, rendered as 1-(4-ethylphenyl)-2-(methylamino)propan-1-one in IUPAC nomenclature. Its chemical formula is C12H17NO. Like 4-MEC, 4-EMC is a substituted cathinone. It is essentially a mephedrone analogue, simultaneously a stimulant/enactogen as well as belonging to the amphetamine, phenethylamine and cathinone groups.