You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-(9H-fluoren-9-ylmethoxycarbonylamino)butanoylamino]-4,4,4-trifluorobutanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H23F3N2O5
assistant