1-Naphthalenesulfonic acid, 6-diazo-5,6-dihydro-5-oxo-, 4-benzoyl-1,3-phenylene ester 111373-09-2 2,4-Dihydroxybenzophenone, 2-diazo-1,2-dihydro-1-oxo-5-naphthalenesulfonate diester 31001-73-7 4-Benzoyl-1,3-phenylene bis(6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulphonate) EINECS 250-425-2 NSC 343232