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 (2E)-2-[[2-(4-chlorophenyl)-1H-indol-3-yl]methylidene]-6,7-dihydroxy-1-benzofuran-3-one is given. What is its corresponding molecular formula?
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C23H14ClNO4
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