Dispiro[m-dioxane-2,5'(8'H)-[1,4]ethanonaphthalene-8',2''-m-dioxane](8CI); 1,4-Ethanonaphthalene-5,8-dione, cyclic bis(1,3-propanediyl acetal);1,4-Ethanonaphthalene-5,8-dione, cyclic bis(trimethylene acetal)
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