1	RIS	1-hydroxy-2-(3-pyridinyl)ethylidene bis-phosphonic acid	1.000
2	UNR	3-(2-hydroxy-2,2-diphosphonoethyl)-1-methylpyridinium	0.944
3	M0N	(1-hydroxy-2-imidazo[1,2-a]pyridin-3-ylethane-1,1-diyl)bis(phosphonic acid)	0.762
4	C6J	2-(2,2-diphosphonoethyl)-1-methylpyridin-1-ium	0.700