preferred_name: D-proline(out) + H(+)(out) <=> D-proline(in) + H(+)(in)
preferred_name_lc: d-proline(out) + h(+)(out) <=> d-proline(in) + h(+)(in)
label: D-proline(out) + H(+)(out) <=> D-proline(in) + H(+)(in)
label_lc: d-proline(out) + h(+)(out) <=> d-proline(in) + h(+)(in)