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 methyl 1-[5-[(4-chloro-2-fluorophenyl)methylamino]pyrazin-2-yl]-2-(trifluoromethyl)benzimidazole-5-carboxylate is given. What is its corresponding molecular formula?
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C21H14ClF4N5O2
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