1	4M8	(2s)-2-amino-4-[(S)-hydroxy(methoxy)phosphoryl]butanoic acid	1.000
2	JQ5	4-[ethoxy(oxidanyl)phosphoryl]-4-oxidanylidene-butanoic acid	0.786
3	E7P	(2s)-2-amino-4-phosphonobutanoic acid	0.769
4	PPQ	Phosphinothricin	0.769