phenacemide phenacemide phenacemide (inn, ban) (brand name phenurone), also known as phenylacetylurea, is an anticonvulsant of the ureide (acetylurea) class. it is a congener and ring-opened analogue of phenytoin (a hydantoin), and is structurally related to the barbiturates and to other hydantoins. phenacemide was introduced in 1949 for the treatment of epilepsy, but was eventually withdrawn due to toxicity. phenacemideclinical datatrade namesphenuroneahfs/drugs.commicromedex detailed consumer informationatc coden03ax07 (who) pharmacokinetic dataelimination half-life22–25 hoursidentifiers iupac name n-carbamoyl-2-phenyl-acetamide cas number63-98-9 ypubchem cid4753iuphar/bps7265drugbankdb01121 ychemspider4589 yuniipai7j52v09keggd00504 ychemblchembl918 ycomptox dashboard (epa)dtxsid6023442 echa infocard100.000.519 chemical and physical dataformulac9h10n2o2molar mass178.191 g·mol−13d model (jsmol)interactive image smiles o=c(nc(=o)n)cc1ccccc1 inchi inchi=1s/c9h10n2o2/c10-9(13)11-8(12)6-7-4-2-1-3-5-7/h1-5h,6h2,(h3,10,11,12,13) ykey:xpfrxwcvyueort-uhfffaoysa-n y (verify)