1	6GU	6-chloroguanine	1.000
2	2BP	9h-purin-2-amine	0.909
3	ES4	6-chloro-9h-purine	0.909
4	06K	2,6-bis(chloranyl)-7h-purine	0.833
5	6AP	9h-purine-2,6-diamine	0.833
6	BCP	2-bromo-6-chloro-purine	0.833
7	CFP	6-chloro-2-fluoropurine	0.833
8	DX4	2-amino-1,9-dihydro-6h-purine-6-thione	0.833
9	GUN	Guanine	0.833
10	HH5	6-iodanyl-7~{H}-purin-2-amine	0.833
11	6GO	6-O-methylguanine	0.769
12	8IG	8-iodo-guanine	0.769
13	9MG	9-methylguanine	0.769
14	ANG	8-aminoguanine	0.769
15	B55	2-amino-8-sulfanyl-1,9-dihydro-6h-purin-6-one	0.769
16	BRG	8-bromoguanine	0.769
17	MY6	2-amino-7-methyl-1,7-dihydro-6h-purin-6-one	0.769
18	OXG	8-oxoguanine	0.769
19	W5M	9-methyl-9h-purine-2,6-diamine	0.769
20	6MP	6-methylpurine	0.750
21	ADE	Adenine	0.750
22	BP1	6-bromo-7h-purine	0.750
23	HPA	Hypoxanthine	0.750
24	PM6	9h-purine-6-thiol	0.750
25	NDM	7,9-dimethylguanine	0.714