1	4NP	4-nitrophenyl phosphate	1.000
2	PNP	Methyl-phosphonic acid mono-(4-nitro-phenyl) ester	0.867
3	HPS	Phenyl dihydrogen phosphate	0.786
4	4OJ	(2-methylphenyl) dihydrogen phosphate	0.733
5	GWM	(4-methylphenyl) dihydrogen phosphate	0.733