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