1	DEP	Diethyl phosphonate	1.000
2	DPF	Diethyl hydrogen phosphate	0.889
3	DPJ	O,O-diethyl hydrogen thiophosphate	0.889
4	DFP	Diisopropyl phosphonate	0.800
5	E9E	1-[methoxy(methyl)phosphoryl]oxyethane	0.778
6	DII	Methylphosphonic acid diisopropyl ester	0.727
7	TEN	Triethyl phosphate	0.727