You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2,4-dichloro-N-[2-(diethylamino)ethyl]-N-(6-ethyl-1,3-benzothiazol-2-yl)benzamide by IUPAC nomenclature, provide its molecular formula.
user
C22H25Cl2N3OS
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