1	QAF	{2-[3-(hex-1-yn-1-yl)pyridinium-1-yl]ethane-1,1-diyl}bis(phosphonate)	1.000
2	476	3-butyl-1-(2,2-diphosphonoethyl)pyridinium	0.909
3	PB6	3-[(1e)-but-1-en-1-yl]-1-(2,2-diphosphonoethyl)pyridinium	0.909