Table 1. Chemical formula, numbering and IUPAC name of the fragments.

	2	1-Amino-3-(2-pyridyl)isoquinoline
	3	1-Amino-3-(3-pyridyl)isoquinoline
	4	6-Amino-2,2′-bipyridine
	5	4-(4-Methylpiperazin-1-yl)-6-phenylpyrimidin-2-amine
	6	2-(1-Methylimidazol-2-yl)-4,6-dipyridine

IUPAC, International Union of Pure and Applied Chemistry.