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