You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(2-chlorophenyl)-N-(2,3-dihydro-1-benzofuran-5-yl)-5-oxopyrrolidine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H17ClN2O3
assistant