3-Bromo-4-fluoro-2-(trifluoromethoxy)pyridine-5-sulfonyl chloride
4-Bromo-6-hydroxy-3-(trifluoromethoxy)pyridine-2-sulfonyl chloride
3-Bromo-2-fluoro-5-(trifluoromethoxy)pyridine-6-sulfonyl chloride
3-Bromo-6-methoxy-4-(trifluoromethoxy)pyridine-2-acetic acid