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