You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-4-fluoro-1-[3-(1H-imidazol-5-yl)propanoyl]-N-[(S)-phenyl-(4-propan-2-ylphenyl)methyl]pyrrolidine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H31FN4O2
assistant