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 (2Z)-2-[(6-chloro-1H-pyrrolo[2,3-b]pyridin-3-yl)methylidene]-6-methoxy-7-(piperazin-1-ylmethyl)-1-benzofuran-3-one is given. What is its corresponding molecular formula?
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C22H21ClN4O3
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