1	209	8-amino-1,3-dimethyl-3,7-dihydropurine-2,6-dione	1.000
2	TEP	Theophylline	0.929
3	CFF	Caffeine	0.867
4	H33	8-chloro-1,3-dimethyl-3,7-dihydro-1h-purine-2,6-dione	0.867
5	EXU	1,3,7-trimethyl-9h-purine-2,6,8-trione	0.812
6	37T	Theobromine	0.800
7	XAN	Xanthine	0.786
8	E7R	1,3-dimethyl-7-propyl-purine-2,6-dione	0.765
9	IBM	3-isobutyl-1-methylxanthine	0.765
10	8HX	8-hydroxy-3,9-dihydro-1h-purine-2,6-dione	0.733
11	8TX	8-thioxo-3,7,8,9-tetrahydro-1h-purine-2,6-dione	0.733
12	ANG	8-aminoguanine	0.733
13	URC	Uric acid	0.733
14	HPA	Hypoxanthine	0.714
15	7UM	3-methyl-7-propyl-purine-2,6-dione	0.706