2,2',4,4'-Tetrahydroxybenzophenone
https://www.biotecsur.org/shop/fm-3b-t0118-22-44-tetrahydroxybenzophenone-70980
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2,2',4,4'-Tetrahydroxybenzophenone 25g : UV stabilizer for plastics, coatings, and optical materials.
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