1	8NX	8-nitro-3,7-dihydro-1h-purine-2,6-dione	1.000
2	XAN	Xanthine	0.786
3	8HX	8-hydroxy-3,9-dihydro-1h-purine-2,6-dione	0.733
4	8TX	8-thioxo-3,7,8,9-tetrahydro-1h-purine-2,6-dione	0.733
5	URC	Uric acid	0.733
6	HPA	Hypoxanthine	0.714