You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (7R,9R)-9-[(2S)-1-(benzenesulfonyl)propan-2-yl]-7-[2-(2-ethoxyethoxy)ethyl]-10-oxa-1,4-dithiaspiro[4.5]decane into molecular formula.
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C22H34O5S3
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