1	DX4	2-amino-1,9-dihydro-6h-purine-6-thione	1.000
2	A1IBK	2-azanyl-8-methyl-3,7-dihydropurine-6-thione	0.917
3	2BP	9h-purin-2-amine	0.909
4	PM6	9h-purine-6-thiol	0.909
5	6AP	9h-purine-2,6-diamine	0.833
6	6GU	6-chloroguanine	0.833
7	GUN	Guanine	0.833
8	HH5	6-iodanyl-7~{H}-purin-2-amine	0.833
9	XQG	6-methylsulfanyl-9h-purine	0.833
10	WUT	9~{H}-purine	0.818
11	A1IBL	2-azanyl-8-propyl-3,7-dihydropurine-6-thione	0.786
12	6GO	6-O-methylguanine	0.769
13	8IG	8-iodo-guanine	0.769
14	9MG	9-methylguanine	0.769
15	A1LXN	2-azanyl-8-methyl-1,9-dihydropurin-6-one	0.769
16	ANG	8-aminoguanine	0.769
17	B55	2-amino-8-sulfanyl-1,9-dihydro-6h-purin-6-one	0.769
18	BRG	8-bromoguanine	0.769
19	MY6	2-amino-7-methyl-1,7-dihydro-6h-purin-6-one	0.769
20	OXG	8-oxoguanine	0.769
21	W5M	9-methyl-9h-purine-2,6-diamine	0.769
22	6MP	6-methylpurine	0.750
23	ADE	Adenine	0.750
24	BP1	6-bromo-7h-purine	0.750
25	ES4	6-chloro-9h-purine	0.750
26	HPA	Hypoxanthine	0.750
27	NDM	7,9-dimethylguanine	0.714