You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(1,3-dioxo-3a,4,7,7a-tetrahydroisoindol-2-yl)-4-methyl-N-[1-[4-(trifluoromethoxy)phenyl]ethyl]pentanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H27F3N2O4
assistant