What is three,4-DMMC?three,4-DMMC, also known as three,four-Dimethylmethcathinone, can be a synthetic stimulant belonging to your cathinone spouse and children. Cathinones are psychoactive substances that have consequences much like amphetamines, and three,four-DMMC is not any exception. It shares structural similarities with mephedrone (4-MMC), Ye