1	MUA	9-methyl uric acid	1.000
2	8HX	8-hydroxy-3,9-dihydro-1h-purine-2,6-dione	0.923
3	URC	Uric acid	0.923
4	XDS	(5s)-5-(dioxidanyl)-9-methyl-7h-purine-2,6,8-trione	0.867
5	XAN	Xanthine	0.846
6	IUP	5-(hydro)peroxoisourate	0.800
7	5JQ	2-thioxo-2,3,7,9-tetrahydro-1h-purine-6,8-dione	0.786
8	8TX	8-thioxo-3,7,8,9-tetrahydro-1h-purine-2,6-dione	0.786
9	9MG	9-methylguanine	0.786
10	OXG	8-oxoguanine	0.786
11	HPA	Hypoxanthine	0.769
12	EXU	1,3,7-trimethyl-9h-purine-2,6,8-trione	0.750
13	37T	Theobromine	0.733
14	NDM	7,9-dimethylguanine	0.733
15	TEP	Theophylline	0.733
16	UAN	9-methyl-2-(methylamino)-1h-purin-6-one	0.733
17	290	6-methyl-3,9-dihydro-2h-purin-2-one	0.714
18	2ON	2-sulfanyl-1,9-dihydro-6h-purin-6-one	0.714
19	8G8	2-chloranyl-9-methyl-purine	0.714
20	ADZ	9-methyl-9h-purin-6-amine	0.714
21	AZA	8-azaxanthine	0.714
22	BOA	2-bromo-6-hydroxy-purine	0.714
23	GUN	Guanine	0.714
24	IGA	6-amino-3,7-dihydro-2h-purin-2-one	0.714