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 5-(3,3-dimethylbut-1-ynyl)-3-[[1,4-dioxaspiro[4.5]decan-8-yl(methyl)amino]-methylamino]thiophene-2-carboxylic acid is given. What is its corresponding molecular formula?
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C21H30N2O4S
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