preferred_name: a menaquinone + NADH + H(+) <=> a menaquinol + NAD(+)
preferred_name_lc: a menaquinone + nadh + h(+) <=> a menaquinol + nad(+)
label: a menaquinone + NADH + H(+) <=> a menaquinol + NAD(+)
label_lc: a menaquinone + nadh + h(+) <=> a menaquinol + nad(+)