You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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(2R)-2-acetamido-6-[3-[(3,5-dichlorophenyl)methylcarbamoyl]-2-(2-ethoxyphenyl)-4-hydroxy-5-oxo-2H-pyrrol-1-yl]hexanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C28H31Cl2N3O7
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