4,5-Dihydroxy-3,6-bis[(o-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid tetrasodium salt

4,5-Dihydroxy-3,6-bis[(o-sulfophenyl)azo]-2,7-naphthalenedisulfonic acid tetrasodium salt

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1g
68504-35-8