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 (3S)-5-[2-[(5-chloro-1,3-benzothiazol-2-yl)sulfanyl]acetyl]-3-methyl-1,3-dihydroindol-2-one into molecular formula.
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C18H13ClN2O2S2
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