143067-35-0 4-((1-Butyl-5-cyano-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridinyl)azo)benzoic acid, phenylmethyl ester 75199-13-2 88731-51-5 Benzoic acid, 4-((1-butyl-5-cyano-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-3-pyridinyl)azo)-, phenylmethyl ester Benzyl 4-((1-butyl-5-cyano-1,6-dihydro-2-hydroxy-4-methyl-6-oxopyridin-3-yl)azo)benzoate EINECS 278-115-2