preferred_name: Mg(2+)(in) + 2 Na(+)(out) = Mg(2+)(out) + 2 Na(+)(in)
preferred_name_lc: mg(2+)(in) + 2 na(+)(out) = mg(2+)(out) + 2 na(+)(in)
label: Mg(2+)(in) + 2 Na(+)(out) = Mg(2+)(out) + 2 Na(+)(in)
label_lc: mg(2+)(in) + 2 na(+)(out) = mg(2+)(out) + 2 na(+)(in)