Catalysis of the reaction: S-adenosyl-L-methionine + 3,5,7,3',4'-pentahydroxyflavone = S-adenosyl-L-homocysteine + 3-methoxy-5,7,3',4'-tetrahydroxy-flavone.
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Catalysis of the reaction: S-adenosyl-L-methionine + 3,5,7,3',4'-pentahydroxyflavone = S-adenosyl-L-homocysteine + 3-methoxy-5,7,3',4'-tetrahydroxy-flavone.
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S-adenosyl-L-methionine:3,5,7,3',4'-pentahydroxyflavone 3-O-methyltransferase activity,
flavonoid 3-methyltransferase activity,
flavonol 3-O-methyltransferase activity,
quercetin 3-O-methyltransferase activity
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