You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[6-(4-chlorophenyl)-2-oxo-10-thia-1,5,6,8-tetrazatricyclo[7.3.0.03,7]dodeca-3(7),4,8-trien-12-yl]-N-(2-methoxyethyl)acetamide into its molecular formula.
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C18H18ClN5O3S
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