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 = 3',4',5-trihydroxy-3,7-dimethoxyflavone + s-adenosyl-l-homocysteine + h(+)