You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4S)-4-[1-[(2R)-3-(2,4-dimethylphenoxy)-2-hydroxypropyl]benzimidazol-2-yl]-1-(4-methylphenyl)pyrrolidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H31N3O3
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