1	JU2	2-amino-6-bromo-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carbonitrile	1.000
2	GD1	2-amino-5-[(z)-iminomethyl]-3,7-dihydro-4h-pyrrolo[2,3-D]pyrimidin-4-one	0.929
3	HNG	2-amino-5-(aminomethyl)-1,7-dihydro-4h-pyrrolo[2,3-D]pyrimidin-4-one	0.929
4	PQ0	2-amino-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carbonitrile	0.929
5	PRF	7-deaza-7-aminomethyl-guanine	0.929
6	FDB	2-amino-5-methyl-3h-pyrrolo[2,3-D]pyrimidin-4(7h)-one	0.857
7	7DG	7-deazaguanine	0.786
8	QY8	2-amino-3h,4h,7h-pyrrolo[2,3-D]pyrimidin-4-one	0.786
9	2KA	2-amino-4-oxo-4,7-dihydro-3h-pyrrolo[2,3-D]pyrimidine-5-carboxylic acid	0.750
10	QYK	4-azanyl-6-bromanyl-7-methyl-pyrrolo[2,3-D]pyrimidine-5-carbonitrile	0.750
11	BRG	8-bromoguanine	0.733
12	7HX	7h-pyrrolo[2,3-D]pyrimidin-4-ol	0.714