You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[1-[2-(4-tert-butylphenoxy)ethyl]benzimidazol-2-yl]-1-(2-chlorophenyl)pyrrolidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H30ClN3O2
assistant