CAS 5808-22-0 appears in our catalog under these names: Chromotropic acid disodium salt dihydrate, 98%, Disodium Chromotropate Dihydrate (Technical Grade), Chromotropic acid disodium salt dihydrate, 4,5-Dihydroxynaphthalene-2,7-disulfonic acid disodium salt d, Chromotropic acid disodium dihydrate. Offered by: Combi-blocks, TRC, GLPBio, Thermo Scientific (Alfa Aesar), Biosynth. Available pack sizes: 1g, 100g, 25g, 5g, 2,5g, 250mg, 500mg, 250g.