Ethyl 5-amino-2-(difluoromethyl)-3-methoxypyridine-6-carboxylate
5-Amino-2-(difluoromethyl)-3-methoxypyridine-4-carboxylic acid
Ethyl 4-amino-3-(difluoromethyl)-6-methoxypyridine-2-carboxylate
4-Amino-5-(difluoromethyl)-3-methoxypyridine-2-carboxylic acid