(S)-eriodictyol + S-adenosyl-L-methionine <=> (S)-homoeriodictyol + S-adenosyl-L-homocysteine + H(+)
(s)-eriodictyol + s-adenosyl-l-methionine <=> (s)-homoeriodictyol + s-adenosyl-l-homocysteine + h(+)