You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2,4-dichloro-N-[5-[2-oxo-2-[4-(trifluoromethyl)anilino]ethyl]sulfanyl-1,3,4-thiadiazol-2-yl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H11Cl2F3N4O2S2
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