4-methylpentedrone 4-methylpentedrone 4-methylpentedrone (also known as 4-mpd and 4-methyl-α-methylamino-valerophenone), is a stimulant drug of the cathinone class that has been sold online as a designer drug. it is a higher homolog of 4-methylmethcathinone (mephedrone) and 4-methylbuphedrone (4-memabp), and the p-methyl derivative of pentedrone. it can also be viewed as the methylamino analog of pyrovalerone. 4-methylpentedronelegal statuslegal status de: npsg (industrial and scientific use only) uk: class b identifiers iupac name 1-(4-methylphenyl)-2-methylamino-pentan-1-one cas number1373918-61-6 ychemspider58951581uniig83hj935nvchemical and physical dataformulac13h19nomolar mass205.301 g·mol−13d model (jsmol)interactive image smiles cccc(nc)c(=o)c1ccc(c)cc1 inchi inchi=1s/c13h19no/c1-4-5-12(14-3)13(15)11-8-6-10(2)7-9-11/h6-9,12,14h,4-5h2,1-3h3key:akvkbedackjnpo-uhfffaoysa-n a related compound, 4-methyl-α-ethylaminopentiophenone (4-meap), has been found to be incorrectly sold as 4-methylpentedrone.