1-Naphthalenesulfonic acid, 6-diazo-5,6-dihydro-5-oxo-, 6-benzoyl-2,3-dihydroxyphenyl ester 2-Diazo-1,2-dihydro-1-oxo-5-naphthalenesulfonic acid, 2-monoester with 2,3,4-trihydroxybenzophenone 6-Benzoyl-2,3-dihydroxyphenyl 6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate 75578-79-9 EINECS 278-263-8