You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[4-[2-[5-(3,4-dimethoxyphenyl)-6-ethyl-2-oxo-6H-1,3,4-thiadiazin-3-yl]ethyl]phenyl]-1H-pyrazole-5-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C25H27N5O4S
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