1	P2H	1-(2-hydroxy-2,2-diphosphonoethyl)-3-phenylpyridinium	1.000
2	364	3-biphenyl-3-yl-1-(2-hydroxy-2,2-diphosphonoethyl)pyridinium	0.793
3	NI9	3-fluoro-1-(2-hydroxy-2,2-diphosphonoethyl)pyridinium	0.708