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