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