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