Buy Quality Methylone (Bk-MDMA) Online. Methylone (also known as “3,4-methylenedioxy-N-methylcathinone”, “MDMC”, “βk-MDMA” and by the slang term “M1”) is an empathogen and stimulant psychoactive drug. It is a member of the substituted amphetamine, substituted cathinone and substituted methylenedioxyphenethylamine,