Cathinones are differentiated by their ketone substitution to the beta carbon with the amphetamine skeleton, that means They may be ?-keto-amphetamines. 3-MMC has two methyl substitutions on its cathinone skeleton, one at R3 of your phenyl ring, plus a second at the nitrogen team RN.Mephedrone. "Not for human intake. For technical use only. Purity: