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