You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named N-(6-acetyl-3-cyano-5,7-dihydro-4H-thieno[2,3-c]pyridin-2-yl)-2-methylbenzamide is given. What is its corresponding molecular formula?
user
C18H17N3O2S
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