You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 6-[2-(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)-2-oxoethoxy]-2-(thiophen-2-ylmethylidene)-1-benzofuran-3-one into molecular formula.
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C22H21NO6S
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