You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-1-[4-(2-methylpropyl)phenyl]ethyl]-2-[2-(methylsulfonylmethyl)benzimidazol-1-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H29N3O3S
assistant