You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-propyl-3-[4-[4-[3-(trifluoromethyl)phenyl]piperazin-1-yl]but-2-enyl]benzimidazol-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H29F3N4O
assistant