3',4',5-trihydroxy-3,7-dimethoxyflavone + S-adenosyl-L-homocysteine + H(+) => rhamnetin + S-adenosyl-L-methionine
3',4',5-trihydroxy-3,7-dimethoxyflavone + s-adenosyl-l-homocysteine + h(+) => rhamnetin + s-adenosyl-l-methionine
3',4',5-trihydroxy-3,7-dimethoxyflavone + S-adenosyl-L-homocysteine + H(+) => rhamnetin + S-adenosyl-L-methionine
3',4',5-trihydroxy-3,7-dimethoxyflavone + s-adenosyl-l-homocysteine + h(+) => rhamnetin + s-adenosyl-l-methionine