You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[3-(dimethylamino)propyl]-3-ethylsulfonyl-N-(6-nitro-1,3-benzothiazol-2-yl)benzamide;hydrochloride into molecular formula.
user
C21H25ClN4O5S2
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