1-Naphthalenesulfonamide, 6-diazo-5,6-dihydro-N-(4-hydroxyphenyl)-5-oxo- 6-Diazo-5,6-dihydro-N-(4-hydroxyphenyl)-5-oxonaphthalene-1-sulphonamide 67389-43-9 EINECS 266-677-1