1-Naphthalenesulfonic acid, 6-diazo-5,6-dihydro-5-oxo-, 3-benzoyl-6-hydroxy-1,2-phenylene ester 2-Diazo-1,2-dihydro-1-oxo-5-naphthalenesulfonic acid, 2,3-diester with 2,3,4-trihydroxybenzophenone 3-Benzoyl-6-hydroxy-1,2-phenylene bis(6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate) 75578-77-7 EINECS 278-261-7