label: 3-methylquercetin 3'-O-methyltransferase activity
label_lc: 3-methylquercetin 3'-o-methyltransferase activity
description: "Catalysis of the reaction: 3',4',5,7-tetrahydroxy-3-methoxyflavone + S-adenosyl-L-methionine = 3,3'-O-dimethylquercetin + H+ + S-adenosyl-L-homocysteine."