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    | product Name | 1,4-Dioxaspiro[4.4]nona-6,8-diene |  
    | Synonyms | 2,4-Cyclopentadien-1-onecyclic ethylene acetal;  2,4-Cyclopentadien-1-one, cyclic 1,2-ethanediyl acetal; Cyclopentadienone cyclic ethylene acetal |  
    | Molecular Formula | C7H8O2 |  
    | CAS Registry Number | 695-57-8 |  
    | Molecular Structure | ![695-57-8 1,4-Dioxaspiro[4.4]nona-6,8-diene](/cas/UploadFiles_6326/201208/2012082311250957.jpg)  |  
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    | Safety Description |  |  |