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 ethyl 4-[5-(4-butoxyphenyl)-3-oxopent-4-enyl]piperazine-1-carboxylate;hydrochloride is given. What is its corresponding molecular formula?
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C22H33ClN2O4
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