File:4,7-Dihydroxynaphthalene-2-sulfonic acid.svg
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![File:4,7-Dihydroxynaphthalene-2-sulfonic acid.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/4%2C7-Dihydroxynaphthalene-2-sulfonic_acid.svg/176px-4%2C7-Dihydroxynaphthalene-2-sulfonic_acid.svg.png?20220329135102)
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