1	AZA	8-azaxanthine	1.000
2	141	Oxypurinol	0.833
3	AZG	5-amino-1h-[1,2,3]triazolo[4,5-D]pyrimidin-7-ol	0.833
4	XAN	Xanthine	0.833
5	8HX	8-hydroxy-3,9-dihydro-1h-purine-2,6-dione	0.769
6	8TX	8-thioxo-3,7,8,9-tetrahydro-1h-purine-2,6-dione	0.769
7	AZ8	Pyrimido[5,4-E][1,2,4]triazine-5,7(6h,8h)-dione	0.769
8	LUZ	Pteridine-2,4(1h,3h)-dione	0.769
9	URC	Uric acid	0.769
10	7HP	7-hydroxy-pyrazolo[4,3-D]pyrimidine	0.750
11	HPA	Hypoxanthine	0.750
12	PPO	3h-pyrazolo[4,3-D]pyrimidin-7-ol	0.750
13	DUC	Dihydropyrimidine-2,4(1h,3h)-dione	0.727
14	HPY	4-hydroxy-3,4-dihydro-1h-pyrimidin-2-one	0.727
15	OS0	4-oxidanyl-3,4-dihydro-1h-pyrimidin-2-one	0.727
16	URA	Uracil	0.727
17	37T	Theobromine	0.714
18	AZ9	6-methylpyrimido[5,4-E][1,2,4]triazine-5,7(6h,8h)-dione	0.714
19	MUA	9-methyl uric acid	0.714
20	TEP	Theophylline	0.714