1	680	6-methylamino-5-nitroisocytosine	1.000
2	7VJ	2-amino-6-(methylamino)-5-nitrosopyrimidin-4(3h)-one	0.923
3	B57	2,6-diamino-5-nitropyrimidin-4(3h)-one	0.786
4	5NU	5-nitrouracil	0.714
5	B53	2,6-diamino-5-nitrosopyrimidin-4(3h)-one	0.714