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