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