(1-pyridin-2-yl-1H-pyrazol-4-yl)-carbamic acid tert-butyl ester

4'-nitro-2-(pyrazol-1'-yl)pyridine

2-氯吡啶

1-(2-吡啶)-1H-吡唑-4-羧酸乙酯

1-(吡啶-2-基)-1 H-吡唑-4-甲酸