CAS 1934-16-3 appears in our catalog under these names: New Methylene Blue N, New methylene Blue N, pure, New Methylene Blue (C.I. 52030), 70.00%, 3,7-Bis(ethylamino)-2,8-dimethylphenothiazin-5-ium chloride 70% (Dye content), NEW METHYLENE BLUE N, ZINC-FREE FORM. Offered by: Biosynth, Thermo Scientific (Acros), Chemat, Ambeed, Sigma-Aldrich. Available pack sizes: 25g, 50g, 2.5g, 10g, 1g, 100g, 250g, 500g.