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2,7-Naphthalenedisulfonic acid, 3-amino-4-[2-[4'-[2-(2,4-diamino-5-nitrophenyl)diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-, sodium salt (1:2) Structure

2,7-Naphthalenedisulfonic acid, 3-amino-4-[2-[4'-[2-(2,4-diamino-5-nitrophenyl)diazenyl][1,1'-biphenyl]-4-yl]diazenyl]-, sodium salt (1:2)