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 7-[(3S)-1-(3-chloro-4-fluorophenyl)-5-oxopyrrolidine-3-carbonyl]-3,5,6,8-tetrahydropyrido[3,4-d]pyrimidin-4-one is given. What is its corresponding molecular formula?
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C18H16ClFN4O3
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