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