You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 5-(3,4-dimethoxyphenyl)-6-ethyl-3-(3-piperidin-1-ylpropyl)-6H-1,3,4-thiadiazin-2-one into molecular formula.
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C21H31N3O3S
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