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