4,4'-diamino-3,3'-biphenyldisulfonic acid;4,4'-Diamino-(1,1'-biphenyl)-3,3'-disulfonic acid;Benzidine-3,3''-disulfonic acid;2-amino-5-(4-amino-3-sulfophenyl)benzenesulfonic acid;2-amino-5-(4-amino-3-sulfo-phenyl)benzenesulfonic acid;2-azanyl-5-(4-azanyl-3-sulfo-phenyl)benzenesulfonic acid
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