You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-[(3aR,7aR)-1,3-dioxo-3a,4,5,6,7,7a-hexahydroisoindol-2-yl]-N-(5-chloro-2-methoxyphenyl)benzamide .
user
C22H21ClN2O4
assistant