You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[(2S)-3-[(4-chlorophenyl)methyl]-4-oxo-1,3-thiazolidin-2-yl]-N-(pyridin-2-ylmethyl)benzamide by IUPAC nomenclature, provide its molecular formula.
user
C23H20ClN3O2S
assistant