1	RFZ	5,6-dichloro-1-beta-D-ribofuranosyl-1h-benzimidazole	1.000
2	1DA	1-deaza-adenosine	0.773
3	AD3	3-deaza-adenosine	0.773
4	EXX	4,5,6,7-tetrabromo-1-(2-deoxy-beta-D-erythro-pentofuranosyl)-1h-benzimidazole	0.708