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 N-(2,1,3-benzothiadiazol-5-ylmethyl)-N-methyl-5-(phenoxymethyl)pyrazolidine-3-carboxamide is given. What is its corresponding molecular formula?
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C19H21N5O2S
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