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 (5S)-3-[5-[2-(4-fluorophenyl)ethynyl]pyrimidin-2-yl]-5,6,6-trimethyl-1,3-oxazinan-2-one is given. What is its corresponding molecular formula?
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C19H18FN3O2
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