1	2ON	2-sulfanyl-1,9-dihydro-6h-purin-6-one	1.000
2	5JL	2,8-dithioxo-1,2,3,7,8,9-hexahydro-6h-purin-6-one	0.917
3	5JQ	2-thioxo-2,3,7,9-tetrahydro-1h-purine-6,8-dione	0.917
4	HPA	Hypoxanthine	0.909
5	BOA	2-bromo-6-hydroxy-purine	0.833
6	GUN	Guanine	0.833
7	KBQ	2-sulfanylidene-1,7-dihydropyrrolo[2,3-D]pyrimidin-4-one	0.833
8	XAN	Xanthine	0.833
9	YH7	6-amino-1,9-dihydro-2h-purine-2-thione	0.833
10	8HX	8-hydroxy-3,9-dihydro-1h-purine-2,6-dione	0.769
11	8IG	8-iodo-guanine	0.769
12	8TX	8-thioxo-3,7,8,9-tetrahydro-1h-purine-2,6-dione	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	URC	Uric acid	0.769
20	2BP	9h-purin-2-amine	0.750
21	6MP	6-methylpurine	0.750
22	7HX	7h-pyrrolo[2,3-D]pyrimidin-4-ol	0.750
23	9HX	9-deazahypoxanthine	0.750
24	ADE	Adenine	0.750
25	BP1	6-bromo-7h-purine	0.750
26	ES4	6-chloro-9h-purine	0.750
27	PM6	9h-purine-6-thiol	0.750
28	PVW	3-(2-methoxyethyl)-2-thioxo-1,2,3,7-tetrahydro-6h-purin-6-one	0.733
29	TUL	2-thioxo-2,3-dihydropyrimidin-4(1h)-one	0.727
30	28Y	3h-imidazo[2,1-B]purin-4(5h)-one	0.714
31	37T	Theobromine	0.714
32	MUA	9-methyl uric acid	0.714
33	NDM	7,9-dimethylguanine	0.714
34	TEP	Theophylline	0.714
35	UAN	9-methyl-2-(methylamino)-1h-purin-6-one	0.714