1	PR4	1-[(2r)-2-carboxy-2-hydroxyethyl]-L-proline	1.000
2	PR7	1-[(2s)-2-carboxy-2-hydroxyethyl]-L-proline	1.000
3	ZI0	N-malonyl-proline	0.867
4	N80	1-ethenyl-L-proline	0.714