4-[[3-[[3-[[4,5-Dihydro-3-methyl-5-oxo-4-[(4-sulfophenyl)azo]-1H-pyrazol]-1-yl]phenyl]azo]-2,4-dihydroxyphenyl]azo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid
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