英文别名
                        4,5-Dioxo-1-methyl-cyclopentan-1,3-dicarbonsaeure-diethylester;1-Methyl-4,5-dioxo-cyclopentan-1,3-dicarbonsaeure-diethylester;1-Methyl-4,5-dioxo-cyclopentan-1,3-dicarbonsaeure-diaethylester;Opt.-inakt. 4,5-Dioxo-1-methyl-cyclopentan-dicarbonsaeure-(1,3)-diaethylester