Synonyms: 1H-Pyrazole-4-methanesulfonicacid, 2,3-dihydro-a-[[4-[[(6-methoxy-3-pyridazinyl)amino]sulfonyl]phenyl]amino]-1,5-dimethyl-3-oxo-2-phenyl-,monosodium salt (9CI); 3-Pyrazoline-4-methanesulfonic acid, a-[p-[(6-methoxy-3-pyridazinyl)sulfamoyl]anilino]-2,3-dimethyl-5-oxo-1-phenyl-,sodium salt (7CI,8CI); Sulphenazone