2,5-dipyridin-2-yl-1,3,4-thiadiazole

2-氰基吡啶

5-(2-吡啶基)-1H-四唑

2-(吡啶-2-基)噻唑-4-羧酸乙酯

2-(2-吡啶)-4-噻唑羧酸