You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-imidazo[2,1-b][1,3]thiazol-6-yl-N-[1-[3-(trifluoromethyl)phenyl]butyl]acetamide by IUPAC nomenclature, provide its molecular formula.
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C18H18F3N3OS
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