preferred_name: uridine(out) + H(+)(out) => uridine(in) + H(+)(in)
preferred_name_lc: uridine(out) + h(+)(out) => uridine(in) + h(+)(in)
label: uridine(out) + H(+)(out) => uridine(in) + H(+)(in)
label_lc: uridine(out) + h(+)(out) => uridine(in) + h(+)(in)