1	5OY	5-phosphono-L-norvaline	1.000
2	2JJ	5-phosphono-D-norvaline	1.000
3	KPA	2-oxo-5-phosphonopentanoic acid	0.846
4	P4F	5,5-difluoro-4-oxo-5-phosphono-D-norvaline	0.800
5	G88	(2s)-2-(phosphonomethyl)pentanedioic acid	0.733