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tetrasodium 4,5-dihydroxy-3,6-bis[(4-nitro-2-sulphonatophenyl)azo]naphthalene-2,7-disulphonate Structure

tetrasodium 4,5-dihydroxy-3,6-bis[(4-nitro-2-sulphonatophenyl)azo]naphthalene-2,7-disulphonate