You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[[5-[2-(4-benzylsulfonylpiperazin-1-yl)-2-oxoethyl]sulfanyl-1,3,4-thiadiazol-2-yl]sulfanyl]acetamide into molecular formula.
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C17H21N5O4S4
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