1	B53	2,6-diamino-5-nitrosopyrimidin-4(3h)-one	1.000
2	B57	2,6-diamino-5-nitropyrimidin-4(3h)-one	0.917
3	7VJ	2-amino-6-(methylamino)-5-nitrosopyrimidin-4(3h)-one	0.769
4	0FU	2,5,6-triaminopyrimidin-4-ol	0.750
5	LG3	Pyrimidine-2,4-diamine	0.727
6	680	6-methylamino-5-nitroisocytosine	0.714