a 7-hydroxyisoflavone + S-adenosyl-L-methionine <=> a 7-methoxyisoflavone + S-adenosyl-L-homocysteine + H(+)
a 7-hydroxyisoflavone + s-adenosyl-l-methionine <=> a 7-methoxyisoflavone + s-adenosyl-l-homocysteine + h(+)
a 7-hydroxyisoflavone + S-adenosyl-L-methionine <=> a 7-methoxyisoflavone + S-adenosyl-L-homocysteine + H(+)
a 7-hydroxyisoflavone + s-adenosyl-l-methionine <=> a 7-methoxyisoflavone + s-adenosyl-l-homocysteine + h(+)