You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N,2-dimethyl-5-[(2-oxo-1H-pyridin-3-yl)methoxy]-1-benzofuran-3-carboxamide;oxolane is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24N2O5
assistant