1	OMH	O-[(S)-hydroxy(methoxy)phosphoryl]-L-serine	1.000
2	MIR	Monoethylphosphorylserine	0.923
3	MIS	Monoisopropylphosphorylserine	0.857
4	SGR	O-[(R)-amino(methoxy)phosphoryl]-L-serine	0.846
5	SGX	O-[(S)-amino(methoxy)phosphoryl]-L-serine	0.846
6	SVX	O-[(R)-ethoxy(methyl)phosphoryl]-L-serine	0.786
7	2RX	O-thiophosphono-L-serine	0.769
8	SBG	O-[(S)-hydroxy(methyl)phosphoryl]-L-serine	0.769
9	SEP	Phosphoserine	0.769
10	SVV	O-[(S)-amino(hydroxy)phosphoryl]-L-serine	0.769
11	SVW	O-[(R)-amino(hydroxy)phosphoryl]-L-serine	0.769
12	GSE	L-alpha-glycerophosphorylserine	0.750
13	SGB	O-[(S)-methyl(1-methylethoxy)phosphoryl]-L-serine	0.733
14	D11	D-phosphothreonine	0.714
15	FGP	2-amino-3-hydroxy-3-phosphonooxy-propionic acid	0.714
16	KSV	(2r)-2,3-dihydroxypropyl ethyl hydrogen (S)-phosphate	0.714
17	T8L	Thio-phosohothreonine	0.714
18	TPO	Phosphothreonine	0.714
19	YTH	O-phosphono-L-allothreonine	0.714