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