5-(Difluoromethyl)-4-nitro-3-(trifluoromethyl)pyridine-2-sulfonyl chloride
6-Nitro-2-(trifluoromethoxy)pyridine-3-sulfonyl chloride
6-Fluoro-2-iodo-3-(methylthio)pyridine
2-Chloro-6-methoxy-3-(trifluoromethoxy)pyridine-5-sulfonyl chloride
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