1	LXN	Alloxan	1.000
2	BR8	Barbituric acid	0.900
3	ODF	5-oxidanyl-1~{H}-pyrimidine-2,4-dione	0.900
4	FOU	(5s,6r)-5-fluoro-6-hydroxydihydropyrimidine-2,4(1h,3h)-dione	0.818
5	DUC	Dihydropyrimidine-2,4(1h,3h)-dione	0.800
6	HPY	4-hydroxy-3,4-dihydro-1h-pyrimidin-2-one	0.800
7	OS0	4-oxidanyl-3,4-dihydro-1h-pyrimidin-2-one	0.800
8	URA	Uracil	0.800
9	A1BWI	5-ethyl-1,3-diazinane-2,4,6-trione	0.750
10	5UC	5-chloropyrimidine-2,4(1h,3h)-dione	0.727
11	6MU	6-methylpyrimidine-2,4-diol	0.727
12	6UA	6-aminopyrimidine-2,4(3h,5h)-dione	0.727
13	FPY	(4s)-5-fluoro-4-hydroxy-3,4-dihydropyrimidin-2(1h)-one	0.727
14	IDH	(5s)-5-iododihydro-2,4(1h,3h)-pyrimidinedione	0.727
15	IUR	5-iodouracil	0.727
16	TDR	Thymine	0.727
17	URB	5-bromopyrimidine-2,4(1h,3h)-dione	0.727
18	URF	5-fluorouracil	0.727
19	WBU	5-amino-1h-pyrimidine-2,4-dione	0.727
20	WDL	1,3,5-triazine-2,4,6-triol	0.727
21	XH5	(5s)-5-methyl-1,3-diazinane-2,4-dione	0.727
22	71O	Pyrimidin-2-ol	0.700
23	L60	1,3-diazinan-2-one	0.700