1	URN	5,6-diaminopyrimidine-2,4(1h,3h)-dione	1.000
2	6UA	6-aminopyrimidine-2,4(3h,5h)-dione	0.900
3	WBU	5-amino-1h-pyrimidine-2,4-dione	0.900
4	0FU	2,5,6-triaminopyrimidin-4-ol	0.818
5	I3V	5-azanyl-6-methyl-1~{H}-pyrimidine-2,4-dione	0.818
6	JFD	6-amino-5-bromo-1,2,3,4-tetrahydropyrimidine-2,4-dione	0.818
7	CYT	6-aminopyrimidin-2(1h)-one	0.800
8	DUC	Dihydropyrimidine-2,4(1h,3h)-dione	0.800
9	HPY	4-hydroxy-3,4-dihydro-1h-pyrimidin-2-one	0.800
10	OS0	4-oxidanyl-3,4-dihydro-1h-pyrimidin-2-one	0.800
11	URA	Uracil	0.800
12	IGT	5-azanyl-3,6-dimethyl-1h-pyrimidine-2,4-dione	0.750
13	IHF	5-azanyl-6-ethyl-1h-pyrimidine-2,4-dione	0.750
14	17E	5-methylcytosine	0.727
15	1LD	5-fluorocytosine	0.727
16	1MC	1-methylcytosine	0.727
17	3MC	3-methylcytosine	0.727
18	5UC	5-chloropyrimidine-2,4(1h,3h)-dione	0.727
19	6MU	6-methylpyrimidine-2,4-diol	0.727
20	BR8	Barbituric acid	0.727
21	FPY	(4s)-5-fluoro-4-hydroxy-3,4-dihydropyrimidin-2(1h)-one	0.727
22	IDH	(5s)-5-iododihydro-2,4(1h,3h)-pyrimidinedione	0.727
23	IUR	5-iodouracil	0.727
24	ODF	5-oxidanyl-1~{H}-pyrimidine-2,4-dione	0.727
25	QCI	L-2-aminoglutarimide	0.727
26	TDR	Thymine	0.727
27	URB	5-bromopyrimidine-2,4(1h,3h)-dione	0.727
28	URF	5-fluorouracil	0.727
29	XH5	(5s)-5-methyl-1,3-diazinane-2,4-dione	0.727
30	71O	Pyrimidin-2-ol	0.700
31	L60	1,3-diazinan-2-one	0.700
32	T5V	Pyrimidin-5-amine	0.700