2-Fluoro-3-methoxy-4-(perchlorophenyl)pyridine
5-Fluoro-2-mercapto-3-(perchlorophenyl)pyridine
3-Fluoro-2-mercapto-5-(perchlorophenyl)pyridine
5-Fluoro-3-iodo-2-(perchlorophenyl)pyridine
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