for the following products
1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-benzoylpyridine | 3-Carbamoyl-4-methyl-6-hydroxy-N-ethyl-2-pyridone | 3-Carbomoyl 4-methyl 1-ethyl 6-hydroxy 2-pyridone and 1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridine carboxamide
