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4-Pyridinesulphonic acid5402-20-031 % similar 2,6-Naphthalenedisulfonic acid581-75-931 % similar 2,3-Diaminophenol59649-56-831 % similar 4-Hydroxybenzenesulfonic acid98-67-931 % similar Dansylhydrazine33008-06-930 % similar 2-Amino-N-ethyl-N-phenylbenzenesulfonamide81-10-730 % similar Gamma acid90-51-730 % similar 2-Chloro-5-nitrobenzenesulfonic acid96-73-130 % similar 1,8-Diaminonaphthalene479-27-630 % similar 2-Chloro-p-phenylenediamine sulfate61702-44-130 % similar 2-Chloro-p-phenylenediamine sulfate6219-71-230 % similar 4-Aminonaphthalene-1,8-dicarboxylic anhydride6492-86-030 % similar 2-(4-Aminoanilino)-5-nitrobenzenesulphonic acid91-29-230 % similar 5-Aminoquinaldine54408-50-330 % similar