1	CFP	6-chloro-2-fluoropurine	1.000
2	ES4	6-chloro-9h-purine	0.909
3	06K	2,6-bis(chloranyl)-7h-purine	0.833
4	6GU	6-chloroguanine	0.833
5	A2F	2-fluoroadenine	0.833
6	BCP	2-bromo-6-chloro-purine	0.833
7	2BP	9h-purin-2-amine	0.750
8	6MP	6-methylpurine	0.750
9	ADE	Adenine	0.750
10	BP1	6-bromo-7h-purine	0.750
11	HPA	Hypoxanthine	0.750
12	PM6	9h-purine-6-thiol	0.750