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4-[[4-[(4-Phenylamino-1-naphthalenyl)azo]-1-naphthalenyl]azo]benzene-1,3-disulfonic acid disodium salt Structure

4-[[4-[(4-Phenylamino-1-naphthalenyl)azo]-1-naphthalenyl]azo]benzene-1,3-disulfonic acid disodium salt