preferred_name: chloride(out) + Na(+)(out) = chloride(in) + Na(+)(in)
preferred_name_lc: chloride(out) + na(+)(out) = chloride(in) + na(+)(in)
label: chloride(out) + Na(+)(out) = chloride(in) + Na(+)(in)
label_lc: chloride(out) + na(+)(out) = chloride(in) + na(+)(in)