You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-ethylpiperazin-1-yl)-[1-[[4-(5-fluoro-2-methoxyphenyl)phenyl]methyl]piperidin-2-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H34FN3O2
assistant