Ethypicone

5-methylpyrithyldione

3,3-diethyl-5-methyl-1H-pyridine-2,4-dione

3,3-diethyl-5-methyl-1H-pyridine-2,4-quinone

3,3-Diethyl-5-methyl-2,4(1H,3H)-pyridinedione