You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-[5-(3-chloro-4-methoxyphenyl)-4,6-dioxo-3a,6a-dihydropyrrolo[3,4-d]triazol-3-yl]-N-(3-fluorophenyl)acetamide by IUPAC nomenclature, provide its molecular formula.
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C19H15ClFN5O4
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