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 1-[4-[4-[(5-methyl-2-sulfanylidene-1,3,4-thiadiazol-3-yl)methyl]piperazin-4-ium-1-yl]sulfonylphenyl]ethanone is given. What is its corresponding molecular formula?
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C16H21N4O3S3+
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