You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 2-[(2-chlorophenyl)methyl-[2-(4-chlorophenyl)sulfanylacetyl]amino]-N-propan-2-ylpropanamide using the IUPAC nomenclature.
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C21H24Cl2N2O2S
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