1-Naphthalenesulfonic acid, 3-hydroxy-7-((4-nitrobenzoyl)amino)- 2-(4'-Nitrobenzoylamino)-6-naphthol-8-sulfonic acid 3-Hydroxy-7-((4-nitrobenzoyl)amino)naphthalenesulphonic acid 68516-58-5 EINECS 271-164-0