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-[[[(3,4-dichlorophenyl)methyl-methylamino]-(3-ethoxypropylamino)methylidene]amino]-N,N-dimethylacetamide by IUPAC nomenclature, provide its molecular formula.
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C18H28Cl2N4O2
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