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