Methylone was first sold in 2004 in the Netherlands, advertised as ‘room odorizer’. The drug was sold in liquid form, but can also be found in powder form. Methylone is structurally very similar to MDMA, but not as potent in its effects. It only differs by the addition of one chemical group – a β-ketone. The drug was banned in 2010, along with Mephedrone, as a class B.