What exactly is three,4-DMMC?three,4-DMMC, also known as three,four-Dimethylmethcathinone, is often a artificial stimulant belonging to the cathinone spouse and children. Cathinones are psychoactive substances which have effects just like amphetamines, and 3,four-DMMC is no exception. It shares structural similarities with mephedrone (four-MMC), Ye