You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-chloro-5-(3-chloro-4-methyl-5-oxo-1,2,4-triazol-1-yl)-2-cyanophenyl]ethanesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C12H11Cl2N5O3S
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