1	Q44	N-(6-oxo-6,9-dihydro-3h-purin-2-yl)acetamide	1.000
2	UAN	9-methyl-2-(methylamino)-1h-purin-6-one	0.800
3	30W	N-(6-formyl-4-oxo-3,4-dihydropteridin-2-yl)acetamide	0.722
4	HPA	Hypoxanthine	0.714