3-Amino-6-(difluoromethyl)-4-nitro-2-(trifluoromethoxy)pyridine
3-Amino-4-(difluoromethyl)-2-nitro-5-(trifluoromethoxy)pyridine
6-Amino-2-(difluoromethyl)-4-nitro-3-(trifluoromethoxy)pyridine
2-Amino-6-(difluoromethyl)-3-nitro-4-(trifluoromethoxy)pyridine