1	AZ8	Pyrimido[5,4-E][1,2,4]triazine-5,7(6h,8h)-dione	1.000
2	AZ9	6-methylpyrimido[5,4-E][1,2,4]triazine-5,7(6h,8h)-dione	0.923
3	TOF	1,6-dimethylpyrimido[5,4-E][1,2,4]triazine-5,7(1h,6h)-dione	0.857
4	LUZ	Pteridine-2,4(1h,3h)-dione	0.846
5	141	Oxypurinol	0.769
6	AZA	8-azaxanthine	0.769
7	XAN	Xanthine	0.769
8	8HX	8-hydroxy-3,9-dihydro-1h-purine-2,6-dione	0.714
9	8TX	8-thioxo-3,7,8,9-tetrahydro-1h-purine-2,6-dione	0.714
10	I7U	3-methyl-7~{H}-purine-2,6-dione	0.714
11	PE0	Pterine	0.714
12	URC	Uric acid	0.714