3,4-dihydroxybenzoate + S-adenosyl-L-methionine = vanillate + S-adenosyl-L-homocysteine + H(+)
3,4-dihydroxybenzoate + s-adenosyl-l-methionine = vanillate + s-adenosyl-l-homocysteine + h(+)
3,4-dihydroxybenzoate + S-adenosyl-L-methionine = vanillate + S-adenosyl-L-homocysteine + H(+)
3,4-dihydroxybenzoate + s-adenosyl-l-methionine = vanillate + s-adenosyl-l-homocysteine + h(+)