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