You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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ethyl 2-[[2-[3-(4-fluorophenyl)-7-oxotriazolo[4,5-d]pyrimidin-6-yl]acetyl]amino]benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
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C21H17FN6O4
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