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 (1R)-1-(3,4-dichlorophenyl)-2-propyl-1H-chromeno[2,3-c]pyrrole-3,9-dione is given. What is its corresponding molecular formula?
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C20H15Cl2NO3
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