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Cathinones are differentiated by their ketone substitution to the beta carbon from the amphetamine skeleton, that means They can be β-keto-amphetamines. three-MMC has two methyl substitutions on its cathinone skeleton, 1 at R3 on the phenyl ring, and a second on the nitrogen group RN.Mephedrone. "Not for human usage. For technical use only. Purity