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 3-(2,5-dioxopyrrol-1-yl)-N-[6-oxo-2-(3-oxopropyl)hexyl]propanamide;formaldehyde is given. What is its corresponding molecular formula?
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C18H26N2O7
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