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 2-[4-(5-chloro-2-methylphenyl)piperazin-1-ium-1-yl]-N-(2,3-dihydro-1,4-benzodioxin-6-yl)acetamide is given. What is its corresponding molecular formula?
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C21H25ClN3O3+
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