You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-(benzenesulfonyl)imidazolidin-1-yl]-2-(1,3-benzothiazol-2-ylsulfanyl)ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H17N3O3S3
assistant