2-demethylmenaquinol-11 + S-adenosyl-L-methionine <=> menaquinol-11 + S-adenosyl-L-homocysteine + H(+)
2-demethylmenaquinol-11 + s-adenosyl-l-methionine <=> menaquinol-11 + s-adenosyl-l-homocysteine + h(+)