Buy Pure Quality 4-MPD Crystal Online is a stimulant drug of the cathinone class that has been sold online as a designer drug. It is a higher homologue of 4-Methylmethcathinone and 4-Methylbuphedrone, and the p-Methyl analogue of Pentedrone. The chemical is in clear liquid form and is created from diacetone alcohol by way of hydrogenation.The water solubility and the hydrocarbon portion of the molecule allow it to be compatible with oils providing surfactant and emulsion stabilizing properties