preferred_name: L-leucine(in) + Na(+)(in) => L-leucine(out) + Na(+)(out)
preferred_name_lc: l-leucine(in) + na(+)(in) => l-leucine(out) + na(+)(out)
label: L-leucine(in) + Na(+)(in) => L-leucine(out) + Na(+)(out)
label_lc: l-leucine(in) + na(+)(in) => l-leucine(out) + na(+)(out)