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 N-(1,4-dioxo-2,3-dihydrophthalazin-5-yl)-2-[[2-(3-fluorophenoxy)acetyl]amino]acetamide is given. What is its corresponding molecular formula?
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C18H15FN4O5
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