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 (3E)-5-hydroxy-4,6-dimethyl-3-[(2-nitrophenyl)methylidene]-1H-pyrrolo[2,3-b]pyridin-2-one is given. What is its corresponding molecular formula?
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C16H13N3O4
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