You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethyl 2-[(4-chloro-3-nitrobenzoyl)amino]-4-methyl-5-[(3-methylphenyl)carbamoyl]thiophene-3-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C23H20ClN3O6S
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