2-((1-(2,5-Dichloro-4-sulphophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)naphthalene-1-sulphonic acid;2-{(E)-[1-(2,5-dichloro-4-sulfophenyl)-3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-4-yl]diazenyl}naphthalene-1-sulfonic acid
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