You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-N-[5-[(4-cyanophenyl)methylsulfanyl]-1,3,4-thiadiazol-2-yl]-3-(2,3-dihydro-1-benzofuran-5-yl)prop-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H16N4O2S2
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