a 3,4-dihydroxy-5-(all-trans-polyprenyl)benzoate + S-adenosyl-L-methionine = a 4-hydroxy-3-methoxy-5-(all-trans-polyprenyl)benzoate + S-adenosyl-L-homocysteine + H(+)
a 3,4-dihydroxy-5-(all-trans-polyprenyl)benzoate + s-adenosyl-l-methionine = a 4-hydroxy-3-methoxy-5-(all-trans-polyprenyl)benzoate + s-adenosyl-l-homocysteine + h(+)