5-Hydroxy-2,5-dimethyl-4-oxo-4,5-dihydro-1H-pyrrole-3-carbonitrile

2,5-Dimethylpyrazolo[1,5-a]pyrimidin-7-amine

N-(3-chloroanilino)-2-oxopropanimidoyl cyanide

3-氨基-5-甲基吡唑

2-甲基-6-氧代-1,4,5,6-四氢-3-吡啶甲腈