1	SUN	O-[(R)-(dimethylamino)(ethoxy)phosphoryl]-L-serine	1.000
2	SXE	O-{(S)-ethoxy[(1-methylethyl)amino]phosphoryl}-L-serine	0.824
3	MIR	Monoethylphosphorylserine	0.750
4	SEN	O-[N,N-dimethylphosphoramidate]-L-serine	0.750
5	SVX	O-[(R)-ethoxy(methyl)phosphoryl]-L-serine	0.750
6	MIS	Monoisopropylphosphorylserine	0.706
7	SGB	O-[(S)-methyl(1-methylethoxy)phosphoryl]-L-serine	0.706