7-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-4-hydroxynaphthalene-2-sulphonic acid;7-[(4,5-Dihydro-3-methyl-5-oxo-1H-pyrazol)-1-yl]-4-hydroxy-2-naphthalenesulfonic acid;Einecs 285-793-3
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