(+)-6a-hydroxymaackiain + S-adenosyl-L-methionine = (+)-pisatin + S-adenosyl-L-homocysteine + H(+)
(+)-6a-hydroxymaackiain + s-adenosyl-l-methionine = (+)-pisatin + s-adenosyl-l-homocysteine + h(+)
(+)-6a-hydroxymaackiain + S-adenosyl-L-methionine = (+)-pisatin + S-adenosyl-L-homocysteine + H(+)
(+)-6a-hydroxymaackiain + s-adenosyl-l-methionine = (+)-pisatin + s-adenosyl-l-homocysteine + h(+)