a 5'-hydroxy-3'-methoxyflavone + S-adenosyl-L-methionine <=> a 3',5'-dimethoxyflavone + S-adenosyl-L-homocysteine + H(+)
a 5'-hydroxy-3'-methoxyflavone + s-adenosyl-l-methionine <=> a 3',5'-dimethoxyflavone + s-adenosyl-l-homocysteine + h(+)
a 5'-hydroxy-3'-methoxyflavone + S-adenosyl-L-methionine <=> a 3',5'-dimethoxyflavone + S-adenosyl-L-homocysteine + H(+)
a 5'-hydroxy-3'-methoxyflavone + s-adenosyl-l-methionine <=> a 3',5'-dimethoxyflavone + s-adenosyl-l-homocysteine + h(+)