preferred_name: a reduced flavin + NAD(+) => an oxidized flavin + NADH + 2 H(+)
preferred_name_lc: a reduced flavin + nad(+) => an oxidized flavin + nadh + 2 h(+)
label: a reduced flavin + NAD(+) => an oxidized flavin + NADH + 2 H(+)
label_lc: a reduced flavin + nad(+) => an oxidized flavin + nadh + 2 h(+)