You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[4-[(3-fluorophenyl)methyl]piperazin-1-yl]-2-[(3R)-3-hydroxypiperidin-1-yl]ethanone into its molecular formula.
user
C18H26FN3O2
assistant