1	BWJ	{[(3,5-dichlorophenyl)amino]methylene}bis(phosphonic acid)	1.000
2	3YQ	{[(3-methylpyridin-2-yl)amino]methanediyl}bis(phosphonic acid)	0.750
3	CBQ	[(5-chloro-pyridin-2-ylamino)-phosphono-methyl]-phosphonic acid	0.750