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 4-[[4-(2-chlorophenyl)piperazin-1-ium-1-yl]methyl]-7-hydroxy-8-methylchromen-2-one is given. What is its corresponding molecular formula?
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C21H22ClN2O3+
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