You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-chloro-N-[2-[3-(4-chlorophenyl)-1,2,4-oxadiazol-5-yl]ethyl]benzenesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H13Cl2N3O3S
assistant