4-methylphenmetrazine 4-methylphenmetrazine 4-methylphenmetrazine (mephenmetrazine, 4-mpm, pal-747) is a recreational designer drug with stimulant effects. it is a substituted phenylmorpholine derivative, closely related to better known drugs such as phenmetrazine and 3-fluorophenmetrazine. it was first identified in slovenia in 2015, and has been shown to act as a monoamine releaser with some preference for serotonin release. 4-methylphenmetrazineidentifiers iupac name 3-methyl-2-(4-methylphenyl)morpholine cas number1094649-71-4 1998216-41-3 (hydrochloride)pubchem cid43169333chemspider27935395uniiv88j79bt5jchemical and physical dataformulac12h17nomolar mass191.274 g·mol−13d model (jsmol)interactive image smiles cc1c(occn1)c2=cc=c(c=c2)c inchi inchi=1s/c12h17no/c1-9-3-5-11(6-4-9)12-10(2)13-7-8-14-12/h3-6,10,12-13h,7-8h2,1-2h3key:nwncixfiidvrke-uhfffaoysa-n