cis-4-hydroxy-D-proline => trans-4-hydroxy-L-proline
cis-4-hydroxy-d-proline => trans-4-hydroxy-l-proline
cis-4-hydroxy-D-proline => trans-4-hydroxy-L-proline
cis-4-hydroxy-d-proline => trans-4-hydroxy-l-proline