1	URA	Uracil	1.000
2	DUC	Dihydropyrimidine-2,4(1h,3h)-dione	1.000
3	HPY	4-hydroxy-3,4-dihydro-1h-pyrimidin-2-one	1.000
4	OS0	4-oxidanyl-3,4-dihydro-1h-pyrimidin-2-one	1.000
5	5UC	5-chloropyrimidine-2,4(1h,3h)-dione	0.889
6	6MU	6-methylpyrimidine-2,4-diol	0.889
7	6UA	6-aminopyrimidine-2,4(3h,5h)-dione	0.889
8	BR8	Barbituric acid	0.889
9	FPY	(4s)-5-fluoro-4-hydroxy-3,4-dihydropyrimidin-2(1h)-one	0.889
10	IDH	(5s)-5-iododihydro-2,4(1h,3h)-pyrimidinedione	0.889
11	IUR	5-iodouracil	0.889
12	ODF	5-oxidanyl-1~{H}-pyrimidine-2,4-dione	0.889
13	TDR	Thymine	0.889
14	URB	5-bromopyrimidine-2,4(1h,3h)-dione	0.889
15	URF	5-fluorouracil	0.889
16	WBU	5-amino-1h-pyrimidine-2,4-dione	0.889
17	XH5	(5s)-5-methyl-1,3-diazinane-2,4-dione	0.889
18	71O	Pyrimidin-2-ol	0.875
19	L60	1,3-diazinan-2-one	0.875
20	FOU	(5s,6r)-5-fluoro-6-hydroxydihydropyrimidine-2,4(1h,3h)-dione	0.800
21	FYU	2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbaldehyde	0.800
22	HMU	5-hydroxymethyl uracil	0.800
23	I3V	5-azanyl-6-methyl-1~{H}-pyrimidine-2,4-dione	0.800
24	I6R	6-ethyl-1h-pyrimidine-2,4-dione	0.800
25	IGX	6-methoxy-1h-pyrimidine-2,4-dione	0.800
26	JFD	6-amino-5-bromo-1,2,3,4-tetrahydropyrimidine-2,4-dione	0.800
27	LXN	Alloxan	0.800
28	S76	6-(methylamino)-1h-pyrimidine-2,4-dione	0.800
29	URN	5,6-diaminopyrimidine-2,4(1h,3h)-dione	0.800
30	W8W	5-bromo-1-methylpyrimidine-2,4(1h,3h)-dione	0.800
31	Y3G	5-ethynylpyrimidine-2,4(1h,3h)-dione	0.800
32	9UZ	Piperidine-2,6-dione	0.778
33	CYT	6-aminopyrimidin-2(1h)-one	0.778
34	DJP	5-fluoropyrimidin-2-ol	0.778
35	LDB	4-thiouracil	0.778
36	TUL	2-thioxo-2,3-dihydropyrimidin-4(1h)-one	0.778
37	P1R	Pyrimidine	0.750
38	141	Oxypurinol	0.727
39	5CU	2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid	0.727
40	5NU	5-nitrouracil	0.727
41	AZA	8-azaxanthine	0.727
42	DOR	(4s)-2,6-dioxohexahydropyrimidine-4-carboxylic acid	0.727
43	I5Z	6-cyclopropyl-1h-pyrimidine-2,4-dione	0.727
44	IGT	5-azanyl-3,6-dimethyl-1h-pyrimidine-2,4-dione	0.727
45	IHF	5-azanyl-6-ethyl-1h-pyrimidine-2,4-dione	0.727
46	OG6	6-[bis(oxidanyl)methyl]-5~{H}-pyrimidine-2,4-dione	0.727
47	ORO	Orotic acid	0.727
48	XAN	Xanthine	0.727
49	17E	5-methylcytosine	0.700
50	1LD	5-fluorocytosine	0.700
51	1MC	1-methylcytosine	0.700
52	3MC	3-methylcytosine	0.700
53	QCI	L-2-aminoglutarimide	0.700
54	WDL	1,3,5-triazine-2,4,6-triol	0.700