3-Oxo-2-(p-tolylazo)butyric acid ethyl ester 4-Tolyl-azo-acetessigester [German] 5869-58-9 ACETOACETIC ACID, 2-(p-TOLYLAZO)-, ETHYL ESTER BRN 4472905 Butanoic acid, 2-((4-methylphenyl)azo)-3-oxo-, ethyl ester