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