1	SDP	2-amino-3-(diethoxy-phosphoryloxy)-propionic acid	1.000
2	SVY	O-[bis(1-methylethoxy)phosphoryl]-L-serine	0.882
3	MIR	Monoethylphosphorylserine	0.750
4	SVX	O-[(R)-ethoxy(methyl)phosphoryl]-L-serine	0.750
5	TEN	Triethyl phosphate	0.733
6	MIS	Monoisopropylphosphorylserine	0.706
7	SGB	O-[(S)-methyl(1-methylethoxy)phosphoryl]-L-serine	0.706