label: an 8-hydroxyfurocoumarin + S-adenosyl-L-methionine <=> an 8-methoxyfurocoumarin + S-adenosyl-L-homocysteine + H(+)
label_lc: an 8-hydroxyfurocoumarin + s-adenosyl-l-methionine <=> an 8-methoxyfurocoumarin + s-adenosyl-l-homocysteine + h(+)