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 methyl 4-[[2-[[3-(2,3-dimethylphenyl)-4-oxo-5H-pyrimido[5,4-b]indol-2-yl]sulfanyl]acetyl]amino]benzoate is given. What is its corresponding molecular formula?
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C28H24N4O4S
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