label: 8-hydroxy-7-methoxyflavone + S-adenosyl-L-methionine <=> 7,8-dimethoxyflavone + S-adenosyl-L-homocysteine + H(+)
label_lc: 8-hydroxy-7-methoxyflavone + s-adenosyl-l-methionine <=> 7,8-dimethoxyflavone + s-adenosyl-l-homocysteine + h(+)