[1,1'-Biphenyl]-2,2'-disulfonic acid, 4,4'-diamino-
https://www.resbioagro.com/shop/fm-in-da000dih-11-biphenyl-22-disulfonic-acid-44-diamino-82603
https://www.resbioagro.com/web/image/product.template/82603/image_1920?unique=ef1e0df
4,4'-Diamino Biphenyl Disulfonic Acid, monomer for polymer synthesis, epoxy resins, and lab research.
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