You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[2-(2,5-dichlorophenyl)-2-oxoethyl]-N-(5-methyl-4,5,6,7-tetrahydro-1,3-benzothiazol-2-yl)-4H-pyridine-3-carboxamide into its molecular formula.
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C22H21Cl2N3O2S
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