You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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methyl 2-[3-[(E)-(1-ethyl-2-oxoindol-3-ylidene)methyl]-2,5-dimethylpyrrol-1-yl]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
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C27H28N2O3S
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