Methylone (bk-MDMA) is a chemical drug which is very similar in structure to MDMA and has comparable effects. Methylone is a stimulant with a mild hallucinogenic effect. Because it’s a relatively new substance it’s called a research chemical. Product Name: Methylone (bk-MDMA) crystals Cas No: 191916-41-3 Formula: C11H13NO3 IUPAC: 1-Propanone,1-(1,3-benzodioxol-5-yl)-2-(methylamino)-,(2S) Appearance: White to yellow crystals Purity: above 98.5%