You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-ethyl-N-(5-ethylsulfanyl-1,3,4-thiadiazol-2-yl)-4-methoxybenzenesulfonamide by IUPAC nomenclature, provide its molecular formula.
user
C13H17N3O3S3
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