You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [(3R,4S)-3-fluoro-4-[(6-fluoro-1H-benzimidazol-2-yl)methoxy]pyrrolidin-1-yl]-(4-methoxyphenyl)methanone .
user
C20H19F2N3O3
assistant