You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,4-dichlorophenoxy)-N-[5-[(2-methylphenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H15Cl2N3O2S2
assistant