What on earth is three,4-DMMC?three,4-DMMC, also known as three,4-Dimethylmethcathinone, is a artificial stimulant belonging towards the cathinone family. Cathinones are psychoactive substances that have effects comparable to amphetamines, and three,4-DMMC isn't any exception. It shares structural similarities with mephedrone (4-MMC), another very