You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(3-acetamidophenyl)-N-[(3R)-6-methyl-1-azabicyclo[2.2.2]octan-3-yl]furan-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H25N3O3
assistant