You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[4-chloro-3-[3-(4-chloro-3,5-dimethylphenoxy)propyl]-2-methylindol-1-yl]-1-methylsulfonylbutan-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H29Cl2NO4S
assistant