You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(3aS,8bS)-1,2,3,8b-tetrahydrocyclopenta[b][1]benzofuran-3a-yl]-2,2,2-trifluoroacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H12F3NO2
assistant