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 (4-methylthiadiazol-5-yl) N-[4-[2-ethyl-3-(4-methyl-5-oxo-1,3,4-oxadiazol-2-yl)phenyl]phenyl]carbamate is given. What is its corresponding molecular formula?
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C21H19N5O4S
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