1-Naphthalenesulfonic acid, 6-diazo-5,6-dihydro-5-oxo-, 3-benzoyl-2,6-dihydroxyphenyl ester 2-Diazo-1,2-dihydro-1-oxo-5-naphthalenesulfonic acid, 3-monoester with 2,3,4-trihydroxybenzophenone 3-Benzoyl-2,6-dihydroxyphenyl 6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate 75578-78-8 EINECS 278-262-2