5-ethyl-5-(3-oxo-1-cyclohexenyl)-1,3-diazinane-2,4,6-trione;5-ethyl-5-(3-oxo-1-cyclohexenyl)hexahydropyrimidine-2,4,6-trione;5-ethyl-5-(3-keto-1-cyclohexenyl)barbituric acid;5-Ethyl-5-(3-oxo-1-cyclohexen-1-yl)-2,4,6(1H,3H,5H)-pyrimidinetrione;5-Ethyl-5-(3-oxy-1-cyclohexenyl)-hexahydropyrimidin-2,4,6-trione
5-ethyl-5-(3-oxo-1-cyclohexenyl)-1,3-diazinane-2,4,6-trione