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-cyclopentyl-N-[[4-oxo-3-(pyridin-2-ylmethyl)phthalazin-1-yl]methyl]propanamide is given. What is its corresponding molecular formula?
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C23H26N4O2
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