1,4-二氢-6-(甲硫基)-4-氧代-2-苯基-5-嘧啶甲腈

3-formamidopropanamide

4-ethyl-6-methyl-2-oxo-1H-pyridine-3-carbonitrile

4-氨基-1,2-二氢-6-羟基-2-氧代-3-吡啶甲腈

5-Amino-3-phenyl-4-ethoxycarbonyl-isoxazol