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Phenylhydrazine sulfate52033-74-631 % similar Tetrasodium meso-tetra(4-sulfonatophenyl)porphine39050-26-531 % similar N,N'-Di(2-naphthyl)-p-phenylenediamine93-46-931 % similar Diphenyl sulfone127-63-930 % similar 6PPD793-24-830 % similar 2-Naphthalenesulfonic acid, 7,7′-(carbonyldiimino)bis[4-hydroxy-, sodium salt (1:2)20324-87-230 % similar 4,4'-Diaminodiphenylamine sulfate53760-27-330 % similar N-(4-(Naphthalen-2-yl)phenyl)-[1,1'-biphenyl]-4-amine897921-60-730 % similar