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