4-ethoxy-3-methyl-1-oxidopyridin-1-ium

4,4'-diethoxy-3,3'-ethane-1,2-diyl-bis-pyridine 1,1'-dioxide

3-甲基-4-氨基吡啶

4-氨基烟酸甲酯

4-氨基-5-甲基-3-硝基吡啶