1	E7P	(2s)-2-amino-4-phosphonobutanoic acid	1.000
2	PPQ	Phosphinothricin	0.833
3	4M8	(2s)-2-amino-4-[(S)-hydroxy(methoxy)phosphoryl]butanoic acid	0.769
4	CYX	(3-formyl-but-3-enyl)-phosphonic acid	0.750
5	CCP	Butylphosphonate	0.727