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 2-[4-bromo-2-[[(4-methyl-1,3-thiazol-2-yl)hydrazinylidene]methyl]phenoxy]-N-(2-phenylethyl)acetamide is given. What is its corresponding molecular formula?
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C21H21BrN4O2S
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