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