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 4-(2-methoxyethyl)-1,1-dioxo-8-(pyrazine-2-carbonyl)-1lambda6-thia-4,8-diazaspiro[4.5]decan-3-one is given. What is its corresponding molecular formula?
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C15H20N4O5S
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