Methedrone, also known as 4-methoxymethcatinone, is a psychoactive compound that has been identified as an adulterant of party pills and bath salts.1 3-Methoxymethcathinone (3-MeOMC) (hydrochloride) is a positional isomer of methedrone, having the methoxy group at the 3 rather than the 4 position. It is also the β-keto derivative of 3-methoxymethamphetamine, a psychostimulating drug. The properties of 3-MeOMC have been poorly studied. This product is intended for forensic and research applications.