Methyl 2-amino-5-(difluoromethyl)-4-methylpyridine-3-carboxylate
Ethyl 5-amino-3-(difluoromethyl)-4-methylpyridine-2-carboxylate
Methyl 6-amino-4-(difluoromethyl)-2-methylpyridine-3-carboxylate
Methyl 2-amino-4-(difluoromethyl)-5-methylpyridine-3-carboxylate