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 (3Z)-N-(3,4-dimethylphenyl)-4,7,7-trimethyl-3-[(4-nitrophenyl)hydrazinylidene]-2-oxobicyclo[2.2.1]heptane-1-carboxamide into molecular formula.
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C25H28N4O4
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