sulfadimidine sulfadimidine sulfadimidine or sulfamethazine is a sulfonamide antibacterial. sulfamethazineclinical dataahfs/drugs.cominternational drug namesatc codej01eb03 (who) qj01eq03 (who) qp51ag01 (who)identifiers iupac name 4-amino-n-(4,6-dimethylpyrimidin-2-yl)benzene-1-sulfonamide cas number57-68-1 ypubchem cid5327drugbankdb01582 ychemspider5136 yunii48u51w007fkeggd02436 ychebichebi:102265 ychemblchembl446 yniaid chemdb027749comptox dashboard (epa)dtxsid6021290 echa infocard100.000.315 chemical and physical dataformulac12h14n4o2smolar mass278.33 g·mol−13d model (jsmol)interactive imagemelting point176 °c (349 °f) smiles o=s(=o)(nc1nc(cc(n1)c)c)c2ccc(n)cc2 inchi inchi=1s/c12h14n4o2s/c1-8-7-9(2)15-12(14-8)16-19(17,18)11-5-3-10(13)4-6-11/h3-7h,13h2,1-2h3,(h,14,15,16) ykey:aswvtgncazcnnr-uhfffaoysa-n y (verify) there are non-standardizeda abbreviations for it as "sulfadimidine" (abbreviated sdi and more commonly but less reliablyb sdd) and as "sulfamethazine" (abbreviated smt and more commonly but less reliablyc smz). other names include sulfadimerazine, sulfadimezine, and sulphadimethylpyrimidine.