You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3-methoxynaphthalen-2-yl)-[4-[3-(trifluoromethyl)phenyl]piperazin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H21F3N2O2
assistant