isopropylphenidate isopropylphenidate isopropylphenidate (also known as iph and ippd) is a piperidine based stimulant drug, closely related to methylphenidate, but with the methyl ester replaced by an isopropyl ester. it has similar effects to methylphenidate but with a longer duration of action, and was banned in the uk as a temporary class drug from april 2015 following its unapproved sale as a designer drug. not to be confused with isopropylphenidine or n-isopropyl-n'-phenyl-1,4-phenylenediamine, which is also called ippd. isopropylphenidatelegal statuslegal status ca: schedule iii de: npsg (industrial and scientific use only) uk: class b identifiers iupac name propan-2-yl 2-phenyl-2-(piperidin-2-yl)acetate cas number93148-46-0 ypubchem cid68314762chemspider48062090uniin93y7vg3xfchemical and physical dataformulac16h23no2molar mass261.365 g·mol−13d model (jsmol)interactive image smiles c1(=cc=cc=c1)c(c(=o)oc(c)c)c2ccccn2 inchi inchi=1s/c16h23no2/c1-12(2)19-16(18)15(13-8-4-3-5-9-13)14-10-6-7-11-17-14/h3-5,8-9,12,14-15,17h,6-7,10-11h2,1-2h3key:azvpadmeimlodt-uhfffaoysa-n it has been researched as potential methylphenidate replacement for adhd and narcolepsy, because of fewer side effects.