1	H33	8-chloro-1,3-dimethyl-3,7-dihydro-1h-purine-2,6-dione	1.000
2	TEP	Theophylline	0.929
3	209	8-amino-1,3-dimethyl-3,7-dihydropurine-2,6-dione	0.867
4	CFF	Caffeine	0.867
5	I7U	3-methyl-7~{H}-purine-2,6-dione	0.857
6	EXU	1,3,7-trimethyl-9h-purine-2,6,8-trione	0.812
7	37T	Theobromine	0.800
8	XAN	Xanthine	0.786
9	A1IOQ	7-(2-chloroethyl)-1,3-dimethyl-purine-2,6-dione	0.765
10	E7R	1,3-dimethyl-7-propyl-purine-2,6-dione	0.765
11	IBM	3-isobutyl-1-methylxanthine	0.765
12	A1BD3	Enprofylline	0.750
13	8HX	8-hydroxy-3,9-dihydro-1h-purine-2,6-dione	0.733
14	8TX	8-thioxo-3,7,8,9-tetrahydro-1h-purine-2,6-dione	0.733
15	URC	Uric acid	0.733
16	OKL	8-chloranyl-3-pentyl-7h-purine-2,6-dione	0.722
17	HPA	Hypoxanthine	0.714
18	7UM	3-methyl-7-propyl-purine-2,6-dione	0.706