You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(6-bromo-1,3-benzothiazol-2-yl)-N-[2-(dimethylamino)ethyl]-3-(4-fluorophenyl)sulfanylpropanamide;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H22BrClFN3OS2
assistant