(1,2-Dimethyl-4-(p-tolylsulfonyl)2-butenylidene)hydrazide of isonicotinic acid 4-Pyridinecarboxylic acid, (1,2-dimethyl-4-((4-methylphenyl)sulfonyl)-2-butenylidene)hydrazine 83794-60-9 BRN 5123375 Isonicotinic acid, (1,2-dimethyl-4-(p-tolylsulfonyl)2-butenylidene)hydrazide