CAS 2130-56-5 appears in our catalog under these names: 3,3'-Dicarboxybenzidine, 3,3′-Dicarboxy-4,4′-diaminobiphenyl, 97%, 97%, 4,4'-Diamino-[1,1'-biphenyl]-3,3'-dicarboxylic acid, 98%. Offered by: Biosynth, Chemat, Fluorochem. Available pack sizes: 5g, 2g, 10g, 25g, 50g, 100mg, 250mg, 1g.