propylphenidate propylphenidate propylphenidate (also known as pph) is a piperidine based stimulant drug, closely related to methylphenidate, but with the methyl ester replaced by a propyl ester. it was banned in the uk as a temporary class drug from april 2015 following its unapproved sale as a designer drug. propylphenidatelegal statuslegal status ca: schedule iii de: npsg (industrial and scientific use only) uk: class b identifiers iupac name propyl 2-phenyl-2-(piperidin-2-yl)acetate cas number1071564-47-0 ypubchem cid91844465chemspider52085111unii0q064445gtchemical and physical dataformulac16h23no2molar mass261.365 g·mol−13d model (jsmol)interactive image smiles c1(=cc=cc=c1)c(c(=o)occc)c2ccccn2 inchi inchi=1s/c16h23no2/c1-2-12-19-16(18)15(13-8-4-3-5-9-13)14-10-6-7-11-17-14/h3-5,8-9,14-15,17h,2,6-7,10-12h2,1h3key:prmwweannqswar-uhfffaoysa-n legal status propylphenidate is illegal in sweden as of 26. january 2016, and in finland since 2017.