1,4-Dioxaspiro[4.5]decan-8-oneCyclohexane-1,4-dione monoethylene acetal1,4-Dioxaspiro[4.5]decan-8-one 99%Cyclohexane-1,4-dione monoethylene ketal1,4-Dioxaspiro[4.5]decan-8-one1,4-环己二酮单乙二醇缩酮1,4-二氧杂螺[4.5]癸烷-8-酮1,4-Cyclohexanedione monoethylene acetal1,4-Cyclohexanedion monoethylene acetal