2-(Difluoromethoxy)-3-(perchlorophenyl)-5-(trifluoromethyl)pyridine
5-(Difluoromethoxy)-2-(perchlorophenyl)pyridine
4-(Difluoromethoxy)-3-(perchlorophenyl)pyridine
4-(Difluoromethoxy)-2-(perchlorophenyl)pyridine
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