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FR2642078A1 - FORMOPHENOLIC RESINS OF NOVOLAQUE TYPE RESULTING
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File:Sulfuric-acid-Givan-et-al-1999-3D-vdW.png - Wikipedia
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File:Sulfuric-acid-2D-dimensions.svg - Wikipedia
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Category:Sulfuric acid - Wikimedia Commons
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Category:Sulfuric acid - Wikimedia Commons
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File:Sulfuric-acid-3D-balls.png - Wikimedia Commons
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Amino acid - Wikipedia
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