1	3MC	3-methylcytosine	1.000
2	CYT	6-aminopyrimidin-2(1h)-one	0.889
3	17E	5-methylcytosine	0.800
4	1LD	5-fluorocytosine	0.800
5	1MC	1-methylcytosine	0.800
6	6UA	6-aminopyrimidine-2,4(3h,5h)-dione	0.800
7	71O	Pyrimidin-2-ol	0.778
8	L60	1,3-diazinan-2-one	0.778
9	JFD	6-amino-5-bromo-1,2,3,4-tetrahydropyrimidine-2,4-dione	0.727
10	URN	5,6-diaminopyrimidine-2,4(1h,3h)-dione	0.727
11	W8W	5-bromo-1-methylpyrimidine-2,4(1h,3h)-dione	0.727
12	5AZ	6-amino-1,3,5-triazin-2(1h)-one	0.700
13	8GF	2-methylpyrimidin-4-amine	0.700
14	DJP	5-fluoropyrimidin-2-ol	0.700
15	DUC	Dihydropyrimidine-2,4(1h,3h)-dione	0.700
16	HPY	4-hydroxy-3,4-dihydro-1h-pyrimidin-2-one	0.700
17	LDB	4-thiouracil	0.700
18	LG3	Pyrimidine-2,4-diamine	0.700
19	OS0	4-oxidanyl-3,4-dihydro-1h-pyrimidin-2-one	0.700
20	TI5	5-methylpyrimidin-4-amine	0.700
21	URA	Uracil	0.700