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CAS 300707-13-5 appears in our catalog under these names: 1-Butyl-1h-benzimidazole-2-sulfonic acid, 95%, 1-Butyl-1H-benzo(d)imidazole-2-sulfonic acid, 95+%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 250mg, 1g, 5g.