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