1	9HX	9-deazahypoxanthine	1.000
2	9DG	9-deazaguanine	0.909
3	7HP	7-hydroxy-pyrazolo[4,3-D]pyrimidine	0.818
4	9DA	9-deazaadenine	0.818
5	HPA	Hypoxanthine	0.818
6	PPO	3h-pyrazolo[4,3-D]pyrimidin-7-ol	0.818
7	2ON	2-sulfanyl-1,9-dihydro-6h-purin-6-one	0.750
8	67N	6-methyl-1,6-dihydro-7h-pyrrolo[2,3-C]pyridin-7-one	0.750
9	BOA	2-bromo-6-hydroxy-purine	0.750
10	GIO	Cyclo-(glycine-L-proline) inhibitor	0.750
11	GUN	Guanine	0.750
12	I5Z	6-cyclopropyl-1h-pyrimidine-2,4-dione	0.750
13	JBH	3,4-dihydroquinazolin-4-ol	0.750
14	JPZ	Quinazolin-4(1h)-one	0.750
15	WQG	Quinazolin-4(3h)-one	0.750
16	XAN	Xanthine	0.750
17	4JP	1h-pyrrolo[3,2-B]pyridine	0.727
18	WUT	9~{H}-purine	0.727