1	BR8	Barbituric acid	1.000
2	FOU	(5s,6r)-5-fluoro-6-hydroxydihydropyrimidine-2,4(1h,3h)-dione	0.900
3	LXN	Alloxan	0.900
4	DUC	Dihydropyrimidine-2,4(1h,3h)-dione	0.889
5	HPY	4-hydroxy-3,4-dihydro-1h-pyrimidin-2-one	0.889
6	OS0	4-oxidanyl-3,4-dihydro-1h-pyrimidin-2-one	0.889
7	URA	Uracil	0.889
8	5UC	5-chloropyrimidine-2,4(1h,3h)-dione	0.800
9	6MU	6-methylpyrimidine-2,4-diol	0.800
10	6UA	6-aminopyrimidine-2,4(3h,5h)-dione	0.800
11	FPY	(4s)-5-fluoro-4-hydroxy-3,4-dihydropyrimidin-2(1h)-one	0.800
12	IDH	(5s)-5-iododihydro-2,4(1h,3h)-pyrimidinedione	0.800
13	IUR	5-iodouracil	0.800
14	ODF	5-oxidanyl-1~{H}-pyrimidine-2,4-dione	0.800
15	TDR	Thymine	0.800
16	URB	5-bromopyrimidine-2,4(1h,3h)-dione	0.800
17	URF	5-fluorouracil	0.800
18	WBU	5-amino-1h-pyrimidine-2,4-dione	0.800
19	WDL	1,3,5-triazine-2,4,6-triol	0.800
20	XH5	(5s)-5-methyl-1,3-diazinane-2,4-dione	0.800
21	71O	Pyrimidin-2-ol	0.778
22	L60	1,3-diazinan-2-one	0.778
23	DDP	2,4-diamino-4,6-dihydroxypyrimidine	0.727
24	FYU	2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbaldehyde	0.727
25	HMU	5-hydroxymethyl uracil	0.727
26	I3V	5-azanyl-6-methyl-1~{H}-pyrimidine-2,4-dione	0.727
27	I6R	6-ethyl-1h-pyrimidine-2,4-dione	0.727
28	IGX	6-methoxy-1h-pyrimidine-2,4-dione	0.727
29	JFD	6-amino-5-bromo-1,2,3,4-tetrahydropyrimidine-2,4-dione	0.727
30	S76	6-(methylamino)-1h-pyrimidine-2,4-dione	0.727
31	URN	5,6-diaminopyrimidine-2,4(1h,3h)-dione	0.727
32	W8W	5-bromo-1-methylpyrimidine-2,4(1h,3h)-dione	0.727
33	Y3G	5-ethynylpyrimidine-2,4(1h,3h)-dione	0.727
34	9UZ	Piperidine-2,6-dione	0.700
35	CYT	6-aminopyrimidin-2(1h)-one	0.700
36	DJP	5-fluoropyrimidin-2-ol	0.700
37	LDB	4-thiouracil	0.700
38	TUL	2-thioxo-2,3-dihydropyrimidin-4(1h)-one	0.700