1,4-Dimethyl-3-cyano-6-hydroxypyrid-2-one-5-(4-N-hexylsulfonamidephenylazo) 67599-09-1 Benzenesulfonamide, 4-((5-cyano-1,6-dihydro-2-hydroxy-1,4-dimethyl-6-oxo-3-pyridinyl)azo)-N-hexyl-