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 8-[1-(5-methylthiophen-2-yl)ethyl]-6,8-diazaspiro[3.5]nonane-5,7,9-trione is given. What is its corresponding molecular formula?
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C14H16N2O3S
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