4-硝基烟酸-N-氧化物

4-甲氧基烟酸甲酯

4-氨基哌啶-3-甲醇

4-氯烟酸

4-nitro-3-[2-(4-nitro-1-oxidopyridin-1-ium-3-yl)ethyl]-1-oxidopyridin-1-ium