sulfachlorpyridazine sulfachlorpyridazine sulfachlorpyridazine (inn, usp) is a sulfonamide antibiotic drug used in poultry farming. it has been marketed as vetisulid for use in cattle, swine and birds. sulfachlorpyridazine names preferred iupac name 4-amino-n-(6-chloropyridazin-3-yl)benzene-1-sulfonamide identifiers cas number 80-32-0 y 3d model (jsmol) interactive image beilstein reference 261558 chebi chebi:59057 chembl chembl1443577 chemspider 6382 echa infocard 100.001.155 ec number 201-269-9 kegg d05948 pubchem cid 6634 unii p78d9p90c0 y comptox dashboard (epa) dtxsid9045265 inchi inchi=1s/c10h9cln4o2s/c11-9-5-6-10(14-13-9)15-18(16,17)8-3-1-7(12)2-4-8/h1-6h,12h2,(h,14,15)key: xoxhilfprywfod-uhfffaoysa-n smiles c1=cc(=cc=c1n)s(=o)(=o)nc2=nn=c(c=c2)cl properties chemical formula c10h9cln4o2s molar mass 284.72 g·mol−1 hazards ghs labelling: pictograms signal word warning hazard statements h317 precautionary statements p261, p272, p280, p302+p352, p321, p333+p313, p363, p501 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references