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2-[[4-[(4-Amino-3-hydroxyphenyl)azo]phenyl]azo]-7-(phenylazo)-3,6-naphthalenedisulfonic acid disodium salt Structure

2-[[4-[(4-Amino-3-hydroxyphenyl)azo]phenyl]azo]-7-(phenylazo)-3,6-naphthalenedisulfonic acid disodium salt