preferred_name: Ca(2+)(in) + n H(+)(out) = Ca(2+)(out) + n H(+)(in)
preferred_name_lc: ca(2+)(in) + n h(+)(out) = ca(2+)(out) + n h(+)(in)
label: Ca(2+)(in) + n H(+)(out) = Ca(2+)(out) + n H(+)(in)
label_lc: ca(2+)(in) + n h(+)(out) = ca(2+)(out) + n h(+)(in)