You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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(Z)-4-[4,5-dichloro-2-[2-[methyl-[(1S)-1-phenyl-2-pyrrolidin-1-ylethyl]amino]-2-oxoethyl]anilino]-4-oxobut-2-enoic acid is the IUPAC name of a molecule. Please give its molecular formula.
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C25H27Cl2N3O4
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