2-Amino-3-(difluoromethyl)-5-hydroxypyridine-4-carboxylic acid
2-Amino-3-(difluoromethyl)-4-hydroxypyridine-6-carboxylic acid
2-Amino-3-(difluoromethyl)-4-hydroxypyridine-5-carboxylic acid
3-Amino-6-(difluoromethyl)-2-hydroxypyridine-4-carboxaldehyde