You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3aR,7aR)-1,3-dioxo-3a,4,5,6,7,7a-hexahydroisoindol-2-yl]-2-chloro-N-[(4-chloro-2-nitrophenyl)methyl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H19Cl2N3O5
assistant