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