2-demethylmenaquinol-12 + S-adenosyl-L-methionine <=> menaquinol-12 + S-adenosyl-L-homocysteine + H(+)
2-demethylmenaquinol-12 + s-adenosyl-l-methionine <=> menaquinol-12 + s-adenosyl-l-homocysteine + h(+)