2-BUTENOIC ACID, 4-((5-BUTYL-1,2,4-THIADIAZOL-2-YL)AMINO)-4-OXO-, METHYL ESTER 4-((5-Butyl-1,2,4-thiadiazol-2-yl)amino)-4-oxo-2-butenoic acid methyl ester 90279-01-9 BRN 5578221