1	SVY	O-[bis(1-methylethoxy)phosphoryl]-L-serine	1.000
2	SDP	2-amino-3-(diethoxy-phosphoryloxy)-propionic acid	0.882
3	MIS	Monoisopropylphosphorylserine	0.722
4	SGB	O-[(S)-methyl(1-methylethoxy)phosphoryl]-L-serine	0.722