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 (3,4-dichlorophenyl)-(5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-2-yl)methanone is given. What is its corresponding molecular formula?
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C19H16Cl2N2O
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