 
6-Iodo-2-nitro-4-(trifluoromethoxy)pyridine-3-carboxaldehyde
 
 
6-Iodo-3-nitro-4-(trifluoromethoxy)pyridine-2-carboxaldehyde
 
 
Methyl 4-hydroxy-3-(trifluoromethoxy)-2-(trifluoromethyl)pyridine-5-acetate
 
 
2-(Difluoromethyl)-4-hydroxy-5-(trifluoromethoxy)pyridine-3-carboxaldehyde