1	5CU	2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid	1.000
2	FYU	2,4-dioxo-1,2,3,4-tetrahydropyrimidine-5-carbaldehyde	0.909
3	HMU	5-hydroxymethyl uracil	0.909
4	1RT	4-amino-2-oxo-1,2-dihydropyrimidine-5-carboxylic acid	0.833
5	TDR	Thymine	0.818
6	XH5	(5s)-5-methyl-1,3-diazinane-2,4-dione	0.818
7	VON	(3~{S},4~{S},5~{S},6~{R})-4,5,6-tris(oxidanyl)piperidine-3-carboxylic acid	0.769
8	ES6	2-oxo-1,2-dihydropyridine-3-carboxylic acid	0.750
9	OA7	6-hydroxypyridine-3-carboxylic acid	0.750
10	Y3G	5-ethynylpyrimidine-2,4(1h,3h)-dione	0.750
11	DUC	Dihydropyrimidine-2,4(1h,3h)-dione	0.727
12	HPY	4-hydroxy-3,4-dihydro-1h-pyrimidin-2-one	0.727
13	OS0	4-oxidanyl-3,4-dihydro-1h-pyrimidin-2-one	0.727
14	URA	Uracil	0.727