You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(3aS,4R,5R,7S)-5-hydroxy-4,7-dimethyl-1,3-dioxo-3a,5,6,7a-tetrahydro-4,7-epoxyisoindol-2-yl]-2-(trifluoromethyl)benzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H15F3N2O4
assistant