You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(dimethylamino)-2-oxoethyl]-methyl-[2-[4-(6-methyl-1,3-benzothiazol-2-yl)anilino]-2-oxoethyl]azanium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H25N4O2S+
assistant