1	OPN	{(2-amino-ethyl)-[2-(2-oxo-1,2-dihydro-[1,8]naphthyridin-3-yl)-acetyl]-amino}-acetic acid	1.000
2	GIC	N-(2-aminoethyl)-N-(1h-indol-3-ylacetyl)glycine	0.826
3	KPN	N-(2-aminoethyl)-N-(2,2'-bipyridin-5-ylacetyl)glycine	0.731