4-methylmethylphenidate 4-methylmethylphenidate threo-4-methylmethylphenidate (4-metmp) is a stimulant drug related to methylphenidate. it is slightly less potent than methylphenidate and has relatively low efficacy at blocking dopamine reuptake despite its high binding affinity, which led to its investigation as a possible substitute drug for treatment of stimulant abuse (cf. nocaine). on the other hand, several other simple ring-substituted derivatives of threo-methylphenidate such as the 4-fluoro and 3-chloro compounds are more potent than methylphenidate both in efficacy as dopamine reuptake inhibitors and in animal drug discrimination assays. 4-fluoromethylphenidate (4-ftmp) and 3-chloromethylphenidate (3-ctmp) 4-methylmethylphenidatelegal statuslegal status ca: schedule iii de: npsg (industrial and scientific use only) uk: class b identifiers iupac name methyl (2r)-2-(4-methylphenyl)-2-acetate cas number191790-79-1 y 680996-70-7 (hydrochloride)pubchem cid44296147chemspider8281556 yunii1y11xuo4eychemical and physical dataformulac15h21no2molar mass247.338 g·mol−13d model (jsmol)interactive image smiles cc2ccc(cc2)c(c(=o)oc)c1ccccn1 inchi inchi=1s/c15h21no2/c1-11-6-8-12(9-7-11)14(15(17)18-2)13-5-3-4-10-16-13/h6-9,13-14,16h,3-5,10h2,1-2h3/t13-,14-/m0/s1 ykey:wjzncjioiacdbr-kbpbesrzsa-n y (verify) legality 4-methylmethylphenidate was banned in the uk as a temporary class drug from june 2015 following its unapproved sale as a designer drug.