You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (7S)-5'-chloro-2',5-dioxo-3-phenyl-1'-prop-2-enylspiro[4,6-dihydrothieno[3,2-b]pyridine-7,3'-indole]-2-carboxylic acid into its molecular formula.
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C24H17ClN2O4S
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