1	FDB	2-amino-5-methyl-3h-pyrrolo[2,3-D]pyrimidin-4(7h)-one	1.000
2	GD1	2-amino-5-[(z)-iminomethyl]-3,7-dihydro-4h-pyrrolo[2,3-D]pyrimidin-4-one	0.923
3	HNG	2-amino-5-(aminomethyl)-1,7-dihydro-4h-pyrrolo[2,3-D]pyrimidin-4-one	0.923
4	PQ0	2-amino-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carbonitrile	0.923
5	PRF	7-deaza-7-aminomethyl-guanine	0.923
6	7DG	7-deazaguanine	0.917
7	QY8	2-amino-3h,4h,7h-pyrrolo[2,3-D]pyrimidin-4-one	0.917
8	2KA	2-amino-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carboxylic acid	0.857
9	JU2	2-amino-6-bromo-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carbonitrile	0.857
10	7HX	7h-pyrrolo[2,3-D]pyrimidin-4-ol	0.833
11	44V	(6s)-2-amino-6-methyl-5,6,7,8-tetrahydropteridin-4(3h)-one	0.786
12	44W	2-amino-6-methyl-7,8-dihydropteridin-4(3h)-one	0.786
13	B62	(6r)-2-amino-6-methyl-5,6,7,8-tetrahydropteridin-4(3h)-one	0.786
14	JSO	2-azanyl-6-methyl-3~{H}-pteridin-4-one	0.786
15	XHP	2-amino-6-methylidene-6,7-dihydropteridin-4(3h)-one	0.786
16	GUN	Guanine	0.769
17	KBQ	2-sulfanylidene-1,7-dihydropyrrolo[2,3-D]pyrimidin-4-one	0.769
18	WOY	6,7-dihydro-5h-pyrrolo[2,3-D]pyrimidine	0.750
19	6FP	2-amino-4-oxo-3,4-dihydropteridine-6-carbaldehyde	0.733
20	HHR	6-hydroxymethylpterin	0.733
21	PH2	2-amino-6-hydroxymethyl-7,8-dihydro-3h-pteridin-4-one	0.733
22	ZZZ	6-formyltetrahydropterin	0.733
23	29H	2-aminopyrimido[4,5-D]pyrimidin-4(3h)-one	0.714
24	8IG	8-iodo-guanine	0.714
25	9MG	9-methylguanine	0.714
26	ANG	8-aminoguanine	0.714
27	AQO	2-aminoquinazolin-4(3h)-one	0.714
28	B55	2-amino-8-sulfanyl-1,9-dihydro-6h-purin-6-one	0.714
29	BRG	8-bromoguanine	0.714
30	MY6	2-amino-7-methyl-1,7-dihydro-6h-purin-6-one	0.714
31	OXG	8-oxoguanine	0.714
32	PE0	Pterine	0.714
33	T0A	5-deazatetrahydropterin	0.714