1	141	Oxypurinol	1.000
2	AZA	8-azaxanthine	0.833
3	AZ8	Pyrimido[5,4-E][1,2,4]triazine-5,7(6h,8h)-dione	0.769
4	7HX	7h-pyrrolo[2,3-D]pyrimidin-4-ol	0.750
5	TVW	1h-pyrazolo[3,4-D]pyrimidin-4-amine	0.750
6	DUC	Dihydropyrimidine-2,4(1h,3h)-dione	0.727
7	HPY	4-hydroxy-3,4-dihydro-1h-pyrimidin-2-one	0.727
8	OS0	4-oxidanyl-3,4-dihydro-1h-pyrimidin-2-one	0.727
9	URA	Uracil	0.727
10	AZ9	6-methylpyrimido[5,4-E][1,2,4]triazine-5,7(6h,8h)-dione	0.714
11	X0Y	1,3-dimethyl-1h-pyrrolo[3,4-D]pyrimidine-2,4(3h,6h)-dione	0.714