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 (E)-1-(2-chloro-4-nitrophenyl)-N-[2-(2-chloro-4-nitrophenyl)imidazo[1,2-a]pyridin-3-yl]methanimine is given. What is its corresponding molecular formula?
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C20H11Cl2N5O4
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