You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5,5-dimethyl-1-[4-[4-[3-(trifluoromethyl)phenyl]piperazin-1-yl]butyl]azepan-2-one by IUPAC nomenclature, provide its molecular formula.
user
C23H34F3N3O
assistant