CAS 28407-37-6 appears in our catalog under these names: Direct Blue 218 (Technical Grade), Direct Blue 218, Direct blue 218, 1-Naphthol-3,6-disulfonic acid, 2,2′-(3,3′-dihydroxy-4,4′-biphenylylenebisazo)bis[8-amino-, dicopper deriv., tetrasodium salt, Direct blue 218, 25 g. Offered by: TRC, GLPBio, Biosynth, Chemat, MedChemExpress. Available pack sizes: 10g, 1g, 5g, 25g, 50g, 100g, 100 mg, 1 g.