trans-3-hydroxy-L-proline => cis-3-hydroxy-D-proline
trans-3-hydroxy-l-proline => cis-3-hydroxy-d-proline
trans-3-hydroxy-L-proline => cis-3-hydroxy-D-proline
trans-3-hydroxy-l-proline => cis-3-hydroxy-d-proline