2-((p-Chlorophenyl)azo)-3-oxobutyric acid ethyl ester 4-Chlor-phenyl-azo-acetessigester [German] 5869-60-3 ACETOACETIC ACID, 2-((p-CHLOROPHENYL)AZO)-, ETHYL ESTER BRN 0960967 Butanoic acid, 2-((4-chlorophenyl)azo)-3-oxo-, ethyl ester