You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 3-[[2-[3-[6-(dimethylamino)piperidin-1-ium-3-yl]-1,2,4-oxadiazolidin-5-yl]pyrrolidin-1-ium-1-yl]methyl]cyclohexane-1-carbonitrile is given. What is its corresponding molecular formula?
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C21H40N6O+2
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