3-Oxo-2-(m-tolylazo)butyric acid ethyl ester 3-Tolyl-azo-acetessigester [German] 5869-57-8 ACETOACETIC ACID, 2-(m-TOLYLAZO)-, ETHYL ESTER BRN 5052702 Butanoic acid, 2-((3-methylphenyl)azo)-3-oxo-, ethyl ester