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 2-[[(1R)-1,5-dicyano-2-oxo-3-azaspiro[5.5]undec-4-en-4-yl]sulfanyl]-N-(4-ethylphenyl)acetamide is given. What is its corresponding molecular formula?
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C22H24N4O2S
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