CAS 28983-56-4 appears in our catalog under these names: Benzenesulfonic acid,[[4-[bis[4-[(sulfophenyl)amino]phenyl]methylene]-2,5-cyclohexadien-1-ylidene]amino]-,sodium salt (1:2), Methyl Blue, Methyl Blue, Methyl blue , Methyl Blue (C.I. 42780). Offered by: Chemat, TargetMol, GLPBio, Thermo Scientific (Alfa Aesar), Biosynth. Available pack sizes: 25g, 100g, 500g, 1kg, 500mg, 5g, 0,1kg, 0,25kg.