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-[(3S)-1,1-dioxothiolan-3-yl]-1-[4-(2-phenoxyethyl)piperazin-1-yl]ethanone is given. What is its corresponding molecular formula?
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C18H26N2O4S
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