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-ethyl-3-[6-fluoro-5-[1-(2-morpholin-4-ylethyl)-2-oxopyridin-4-yl]-1,3-benzothiazol-2-yl]urea is given. What is its corresponding molecular formula?
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C21H24FN5O3S
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