label: (+)-6a-hydroxymaackiain + S-adenosyl-L-methionine <=> (+)-pisatin + S-adenosyl-L-homocysteine + H(+)
label_lc: (+)-6a-hydroxymaackiain + s-adenosyl-l-methionine <=> (+)-pisatin + s-adenosyl-l-homocysteine + h(+)