2-氨基-4,7-二羟基-6-甲基蝶啶

2-氨基-1,5-二氢-7-甲基蝶啶-4,6-二酮

3,5-二(乙氧羰基)-4-甲基-1H-吡咯-2-羧酸

4-hydroxy-6-phenyl-quinoline-2-carboxylic acid ethyl ester

N4-Benzoyl-1-(2,3-O-isopropylidene-α-D-ribofuranosyl)-cytosine