1	SXE	O-{(S)-ethoxy[(1-methylethyl)amino]phosphoryl}-L-serine	1.000
2	SUN	O-[(R)-(dimethylamino)(ethoxy)phosphoryl]-L-serine	0.824
3	SVZ	O-[(S)-hydroxy(isopropylamino)phosphoryl]-L-serine	0.765
4	MIR	Monoethylphosphorylserine	0.706
5	SVX	O-[(R)-ethoxy(methyl)phosphoryl]-L-serine	0.706