Cathinones are differentiated by their ketone substitution to the beta carbon of the amphetamine skeleton, which means These are ?-keto-amphetamines. three-MMC has two methyl substitutions on its cathinone skeleton, 1 at R3 on the phenyl ring, as well as a 2nd at the nitrogen group RN.The consequences of 3-MMC are similar to those of copyright (ecs