1	7HX	7h-pyrrolo[2,3-D]pyrimidin-4-ol	1.000
2	7DG	7-deazaguanine	0.909
3	KBQ	2-sulfanylidene-1,7-dihydropyrrolo[2,3-D]pyrimidin-4-one	0.909
4	QY8	2-amino-3h,4h,7h-pyrrolo[2,3-D]pyrimidin-4-one	0.909
5	WOY	6,7-dihydro-5h-pyrrolo[2,3-D]pyrimidine	0.900
6	FDB	2-amino-5-methyl-3h-pyrrolo[2,3-D]pyrimidin-4(7h)-one	0.833
7	HPA	Hypoxanthine	0.818
8	GD1	2-amino-5-[(z)-iminomethyl]-3,7-dihydro-4h-pyrrolo[2,3-D]pyrimidin-4-one	0.769
9	HNG	2-amino-5-(aminomethyl)-1,7-dihydro-4h-pyrrolo[2,3-D]pyrimidin-4-one	0.769
10	PQ0	2-amino-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carbonitrile	0.769
11	PRF	7-deaza-7-aminomethyl-guanine	0.769
12	141	Oxypurinol	0.750
13	2ON	2-sulfanyl-1,9-dihydro-6h-purin-6-one	0.750
14	BOA	2-bromo-6-hydroxy-purine	0.750
15	GUN	Guanine	0.750
16	JBH	3,4-dihydroquinazolin-4-ol	0.750
17	JPZ	Quinazolin-4(1h)-one	0.750
18	N5J	3h-pyrido[3,4-D]pyrimidin-4-one	0.750
19	W4S	7-methyl-7h-pyrrolo[2,3-D]pyrimidin-4-amine	0.750
20	WQG	Quinazolin-4(3h)-one	0.750
21	XAN	Xanthine	0.750
22	GVH	1h-pyrrolo[2,3-B]pyridine	0.727
23	2KA	2-amino-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carboxylic acid	0.714
24	JU2	2-amino-6-bromo-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carbonitrile	0.714