Exactly what is three,four-DMMC?three,four-DMMC, also known as three,four-Dimethylmethcathinone, is a synthetic stimulant belonging on the cathinone spouse and children. Cathinones are psychoactive substances that have results just like amphetamines, and three,four-DMMC isn't any exception. It shares structural similarities with mephedrone (four-MM