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 5-methyl-6-[2-oxo-2-[(2S)-2-thiophen-3-ylpyrrolidin-1-yl]ethyl]-1H-pyrazolo[1,5-a]pyrimidin-7-one is given. What is its corresponding molecular formula?
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C17H18N4O2S
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