You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[3-[(3aR,7aS)-1,3-dioxo-3a,4,7,7a-tetrahydroisoindol-2-yl]propanoyl-[(2-fluorophenyl)methyl]amino]-N-methylpropanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H26FN3O4
assistant