You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-ethyl-2-[[5-(4-ethylanilino)-1,3,4-thiadiazol-2-yl]sulfanyl]-N-(2-methylprop-2-enyl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H24N4OS2
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