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