You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[(2S)-1-(benzenesulfonyl)-3-oxo-2,4-dihydroquinoxalin-2-yl]-N-(4-chlorophenyl)acetamide into its molecular formula.
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C22H18ClN3O4S
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