You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-benzyl-2,5-dichloro-N-(4,6-dimethyl-1,3-benzothiazol-2-yl)thiophene-3-carboxamide into its molecular formula.
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C21H16Cl2N2OS2
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