You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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[(2R)-1-(4-acetyl-3,5-dimethyl-1H-pyrrol-2-yl)-1-oxopropan-2-yl] 2,5-dichlorobenzoate is the IUPAC name of a molecule. Please give its molecular formula.
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C18H17Cl2NO4
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