1	290	6-methyl-3,9-dihydro-2h-purin-2-one	1.000
2	6MP	6-methylpurine	0.909
3	IGA	6-amino-3,7-dihydro-2h-purin-2-one	0.833
4	XAN	Xanthine	0.833
5	WUT	9~{H}-purine	0.818
6	8HX	8-hydroxy-3,9-dihydro-1h-purine-2,6-dione	0.769
7	8TX	8-thioxo-3,7,8,9-tetrahydro-1h-purine-2,6-dione	0.769
8	I7U	3-methyl-7~{H}-purine-2,6-dione	0.769
9	URC	Uric acid	0.769
10	2BP	9h-purin-2-amine	0.750
11	ADE	Adenine	0.750
12	BP1	6-bromo-7h-purine	0.750
13	ES4	6-chloro-9h-purine	0.750
14	HPA	Hypoxanthine	0.750
15	PM6	9h-purine-6-thiol	0.750
16	37T	Theobromine	0.714
17	MUA	9-methyl uric acid	0.714
18	TEP	Theophylline	0.714