1	45F	(4s)-4-(prop-2-yn-1-yloxy)-L-proline	1.000
2	45W	(4s)-4-(ethynyloxy)-D-proline	0.917
3	ZNY	(4r)-4-ethoxy-L-proline	0.917
4	OW7	3-ethoxybenzoic acid	0.714