You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4-[(3aS,5R,7aS)-5-methyl-1,3-dioxo-3a,4,5,6,7,7a-hexahydroisoindol-2-yl]phenyl] (3S)-1-(4-nitrophenyl)-5-oxopyrrolidine-3-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C26H25N3O7
assistant