You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S)-4-[1-[4-(4-chlorophenoxy)butyl]benzimidazol-2-yl]-1-prop-2-enylpyrrolidin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C24H26ClN3O2
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