What is three,4-DMMC?three,4-DMMC, also referred to as 3,four-Dimethylmethcathinone, is actually a synthetic stimulant belonging to the cathinone relatives. Cathinones are psychoactive substances that have results much like amphetamines, and 3,4-DMMC is not any exception. It shares structural similarities with mephedrone (four-MMC), One more well-a