You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(5-chloro-4-methyl-1,3-benzothiazol-2-yl)-N-[3-(dimethylamino)propyl]-3-methylsulfonylbenzamide;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H25Cl2N3O3S2
assistant