Cathinones are differentiated by their ketone substitution within the beta carbon of your amphetamine skeleton, indicating They're β-keto-amphetamines. 3-MMC has two methyl substitutions on its cathinone skeleton, 1 at R3 with the phenyl ring, and a second for the nitrogen team RN.Mephedrone. "Not for human use. For technical use only. Purity: nin