1	29H	2-aminopyrimido[4,5-D]pyrimidin-4(3h)-one	1.000
2	29G	Pyrimido[4,5-D]pyrimidine-2,4-diamine	0.846
3	T0A	5-deazatetrahydropterin	0.846
4	7DG	7-deazaguanine	0.769
5	GUN	Guanine	0.769
6	QY8	2-amino-3h,4h,7h-pyrrolo[2,3-D]pyrimidin-4-one	0.769
7	3WA	4-aminopyrido[2,3-D]pyrimidin-5(8h)-one	0.714
8	8IG	8-iodo-guanine	0.714
9	9MG	9-methylguanine	0.714
10	ANG	8-aminoguanine	0.714
11	B55	2-amino-8-sulfanyl-1,9-dihydro-6h-purin-6-one	0.714
12	BRG	8-bromoguanine	0.714
13	FDB	2-amino-5-methyl-3h-pyrrolo[2,3-D]pyrimidin-4(7h)-one	0.714
14	MY6	2-amino-7-methyl-1,7-dihydro-6h-purin-6-one	0.714
15	OXG	8-oxoguanine	0.714
16	PE0	Pterine	0.714