(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(+)
(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(+)