1	7HP	7-hydroxy-pyrazolo[4,3-D]pyrimidine	1.000
2	PPO	3h-pyrazolo[4,3-D]pyrimidin-7-ol	1.000
3	9HX	9-deazahypoxanthine	0.818
4	9DG	9-deazaguanine	0.750
5	AZA	8-azaxanthine	0.750
6	AZG	5-amino-1h-[1,2,3]triazolo[4,5-D]pyrimidin-7-ol	0.750
7	N5J	3h-pyrido[3,4-D]pyrimidin-4-one	0.750