2,2′-联吡啶-3,3′-二醇

6-(3-hydroxy-1H-pyridin-2-ylidene)cyclohexa-2,4-dien-1-one

N-甲基咪唑

2,3-二甲氧基-6-硝基吡啶

2-氨基-6-溴-5-甲氧基吡啶