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