You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named N-[(2-chlorophenyl)methyl]-2-(6-oxo-8-thia-3,5,10-triazatricyclo[7.4.0.02,7]trideca-1(9),2(7),3,10,12-pentaen-5-yl)acetamide is given. What is its corresponding molecular formula?
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C18H13ClN4O2S
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