You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-(2,6-dimethylphenyl)-4-[1-[(4-propan-2-ylphenyl)methyl]benzimidazol-2-yl]pyrrolidin-2-one into molecular formula.
user
C29H31N3O
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