You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-[1-[2-(2,5-dimethylphenoxy)ethyl]benzimidazol-2-yl]-1-(1-phenylethyl)pyrrolidin-2-one into its molecular formula.
user
C29H31N3O2
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