1	NDM	7,9-dimethylguanine	1.000
2	9MG	9-methylguanine	0.923
3	MY6	2-amino-7-methyl-1,7-dihydro-6h-purin-6-one	0.923
4	GUN	Guanine	0.846
5	8IG	8-iodo-guanine	0.786
6	A1LXN	2-azanyl-8-methyl-1,9-dihydropurin-6-one	0.786
7	ANG	8-aminoguanine	0.786
8	B55	2-amino-8-sulfanyl-1,9-dihydro-6h-purin-6-one	0.786
9	BRG	8-bromoguanine	0.786
10	OXG	8-oxoguanine	0.786
11	W5M	9-methyl-9h-purine-2,6-diamine	0.786
12	2BP	9h-purin-2-amine	0.769
13	HPA	Hypoxanthine	0.769
14	GSY	7-(2-hydroxyethyl)-8-mercaptoguanine	0.750
15	37T	Theobromine	0.733
16	B60	2-amino-8-methyl-7,8-dihydropteridin-4(3h)-one	0.733
17	MUA	9-methyl uric acid	0.733
18	UAN	9-methyl-2-(methylamino)-1h-purin-6-one	0.733
19	2ON	2-sulfanyl-1,9-dihydro-6h-purin-6-one	0.714
20	6AP	9h-purine-2,6-diamine	0.714
21	6GU	6-chloroguanine	0.714
22	7DG	7-deazaguanine	0.714
23	8G8	2-chloranyl-9-methyl-purine	0.714
24	9DG	9-deazaguanine	0.714
25	9QC	5-azanyl-3,6-dihydro-[1,2,3]triazolo[4,5-D]pyrimidin-7-one	0.714
26	ADZ	9-methyl-9h-purin-6-amine	0.714
27	AZG	5-amino-1h-[1,2,3]triazolo[4,5-D]pyrimidin-7-ol	0.714
28	BOA	2-bromo-6-hydroxy-purine	0.714
29	DX4	2-amino-1,9-dihydro-6h-purine-6-thione	0.714
30	HH5	6-iodanyl-7~{H}-purin-2-amine	0.714
31	QY8	2-amino-3h,4h,7h-pyrrolo[2,3-D]pyrimidin-4-one	0.714
32	XAN	Xanthine	0.714
33	AC2	9-hyroxyethoxymethylguanine	0.706