label: a 2-demethylmenaquinone + S-adenosyl-L-methionine => a menaquinone + S-adenosyl-L-homocysteine + H(+)
label_lc: a 2-demethylmenaquinone + s-adenosyl-l-methionine => a menaquinone + s-adenosyl-l-homocysteine + h(+)