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 (15R,19S)-1-acetyl-17-(2,4-dichlorophenyl)-17-azapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9,11,13-hexaene-16,18-dione is given. What is its corresponding molecular formula?
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C26H17Cl2NO3
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