You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2S)-5'-chloro-3-(3-methylbutanoyl)-1'-[(3-methylphenyl)methyl]spiro[1,3-thiazolidine-2,3'-indole]-2'-one .
user
C23H25ClN2O2S
assistant