You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named [2-[(3-cyano-5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophen-2-yl)amino]-2-oxoethyl] 2,3,6-trichlorobenzoate by IUPAC nomenclature, provide its molecular formula.
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C19H15Cl3N2O3S
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