preferred_name: bromide(out) + chloride(in) => bromide(in) + chloride(out)
preferred_name_lc: bromide(out) + chloride(in) => bromide(in) + chloride(out)
label: bromide(out) + chloride(in) => bromide(in) + chloride(out)
label_lc: bromide(out) + chloride(in) => bromide(in) + chloride(out)