You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 5-chloro-N-[5-chloro-2-(4-methylpiperazin-1-yl)phenyl]-2,3-dihydro-1-benzofuran-2-carboxamide ?
user
C20H21Cl2N3O2
assistant