You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-1-(1H-benzimidazol-2-yl)-3-methylbutyl]-3-(2,3-dihydro-1-benzofuran-5-yl)propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H27N3O2
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