preferred_name: nitrate(out) + nitrite(in) => nitrate(in) + nitrite(out)
preferred_name_lc: nitrate(out) + nitrite(in) => nitrate(in) + nitrite(out)
label: nitrate(out) + nitrite(in) => nitrate(in) + nitrite(out)
label_lc: nitrate(out) + nitrite(in) => nitrate(in) + nitrite(out)