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