You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule N-[4-chloro-2-methyl-6-(methylcarbamoyl)phenyl]-5-ethyl-1-(2-fluorophenyl)-1,2,4-triazole-3-carboxamide into molecular formula.
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C20H19ClFN5O2
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