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