preferred_name: cis-4-hydroxy-D-proline => trans-4-hydroxy-L-proline
preferred_name_lc: cis-4-hydroxy-d-proline => trans-4-hydroxy-l-proline
label: cis-4-hydroxy-D-proline => trans-4-hydroxy-L-proline
label_lc: cis-4-hydroxy-d-proline => trans-4-hydroxy-l-proline