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-cyclopropyl-6-[(5-methyl-1-propylpyrazol-4-yl)methyl]-3,5,7,8-tetrahydropyrido[4,3-d]pyrimidin-4-one is given. What is its corresponding molecular formula?
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C18H25N5O
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