(E)-caffeate + S-adenosyl-L-methionine = (E)-ferulate + S-adenosyl-L-homocysteine + H(+)
(e)-caffeate + s-adenosyl-l-methionine = (e)-ferulate + s-adenosyl-l-homocysteine + h(+)
"caffeate O-methyltransferase"
"caffeate o-methyltransferase"