You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-chloro-3-[(4-chlorophenyl)methylsulfanyl]-5,6-dimethoxycyclohexa-2,5-diene-1,4-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H12Cl2O4S
assistant