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