1	DPJ	O,O-diethyl hydrogen thiophosphate	1.000
2	DEP	Diethyl phosphonate	0.889
3	DPF	Diethyl hydrogen phosphate	0.800
4	DZZ	O,O-dimethyl hydrogen thiophosphate	0.778
5	DFP	Diisopropyl phosphonate	0.727
6	E9E	1-[methoxy(methyl)phosphoryl]oxyethane	0.700