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 [1-(6-chloroquinoxalin-2-yl)pyrrolidin-3-yl]-(4,4-difluoropiperidin-1-yl)methanone is given. What is its corresponding molecular formula?
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C18H19ClF2N4O
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