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 4-[4-[(3aS,5R,7aS)-5-methyl-1,3-dioxo-3a,4,5,6,7,7a-hexahydroisoindol-2-yl]phenoxy]benzonitrile .
user
C22H20N2O3
assistant