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