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-[[3-(1,3-dioxo-4,5,6,7-tetrahydroisoindol-2-yl)-2,4,6-triiodophenyl]methyl]butanoic acid is given. What is its corresponding molecular formula?
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C19H18I3NO4
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