4-Bromo-2-nitro-3-(trifluoromethoxy)pyridine-6-sulfonyl chloride
4-Chloro-6-(fluoromethyl)-2-nitro-3-(trifluoromethoxy)pyridine
3-Bromo-5-nitro-6-(trifluoromethoxy)pyridine-2-sulfonyl chloride
2-(Aminomethyl)-3-bromo-5-(trifluoromethoxy)pyridine-6-acetic acid