label: 4',7,8-trihydroxyflavone + S-adenosyl-L-methionine => 4',7-dihydroxy-8-methoxyflavone + S-adenosyl-L-homocysteine + H(+)
label_lc: 4',7,8-trihydroxyflavone + s-adenosyl-l-methionine => 4',7-dihydroxy-8-methoxyflavone + s-adenosyl-l-homocysteine + h(+)