robenacoxib robenacoxib robenacoxib, sold under the brand name onsior, is a nonsteroidal anti-inflammatory drug (nsaid) used in veterinary medicine for the relief of pain and inflammation in cats and dogs. it is a cox-2 inhibitor (coxib). robenacoxibclinical datatrade namesonsiorlicense data eu ema: by inn atcvet codeqm01ah91 (who) legal statuslegal status eu: rx-only identifiers iupac name acetic acid cas number220991-32-2pubchem cid6433107drugbankdb11455chemspider4938295uniiz588009c7cchebichebi:76269chemblchembl2107774comptox dashboard (epa)dtxsid90176607 echa infocard100.210.035 chemical and physical dataformulac16h13f4no2molar mass327.279 g·mol−13d model (jsmol)interactive image smiles o=c(o)cc2c(nc1c(f)c(f)cc(f)c1f)ccc(c2)cc inchi inchi=1s/c16h13f4no2/c1-2-8-3-4-12(9(5-8)6-13(22)23)21-16-14(19)10(17)7-11(18)15(16)20/h3-5,7,21h,2,6h2,1h3,(h,22,23)key:zexgdyfacfxqpf-uhfffaoysa-n