preferred_name: a menaquinol + nitrate = a menaquinone + nitrite + H2O
preferred_name_lc: a menaquinol + nitrate = a menaquinone + nitrite + h2o
label: a menaquinol + nitrate = a menaquinone + nitrite + H2O
label_lc: a menaquinol + nitrate = a menaquinone + nitrite + h2o