nifenazone nifenazone nifenazone is a drug that has been used as an analgesic for a number of rheumatic conditions. nifenazoneclinical dataatc codem02aa24 (who) n02bb05 (who)identifiers iupac name n-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1h-pyrazol-4-yl)nicotinamide cas number2139-47-1 npubchem cid4487chemspider4332 nunii8780f0k71ukeggd01437 ychemblchembl1413176 ncomptox dashboard (epa)dtxsid7045366 echa infocard100.016.716 chemical and physical dataformulac17h16n4o2molar mass308.341 g·mol−13d model (jsmol)interactive image smiles c1ccccc1n2n(c)c(c)=c(c2=o)nc(=o)c3cccnc3 inchi inchi=1s/c17h16n4o2/c1-12-15(19-16(22)13-7-6-10-18-11-13)17(23)21(20(12)2)14-8-4-3-5-9-14/h3-11h,1-2h3,(h,19,22) nkey:brzanexcszczci-uhfffaoysa-n n ny (what is this?) (verify)