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 N-[5-[2-(4-ethylphenoxy)ethyl]-1,3,4-thiadiazol-2-yl]-3,4-difluorobenzamide is given. What is its corresponding molecular formula?
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C19H17F2N3O2S
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