4-Hydroxy-2-nitro-5-(trifluoromethoxy)pyridine-3-carboxaldehyde
3-(Difluoromethyl)-2-hydroxy-4-(trifluoromethoxy)-5-(trifluoromethyl)pyridine
2-Hydroxy-3-nitro-5-(trifluoromethoxy)pyridine-6-carboxylic acid
3-Hydroxy-5-nitro-4-(trifluoromethoxy)pyridine-2-carboxaldehyde