You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-(2,3-dihydro-1-benzofuran-5-ylsulfonyl)-2,7-diazaspiro[4.4]nonane;hydrochloride by IUPAC nomenclature, provide its molecular formula.
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C15H21ClN2O3S
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