You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2,1,3-benzoxadiazol-4-ylsulfonyl)-1-[4-(2,5-dimethylphenyl)piperazin-1-yl]propan-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N4O4S
assistant