You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 4-[2-(4-fluorophenyl)-4-(5-fluoropyrimidin-2-yl)piperazin-1-yl]butan-1-ol is given. What is its corresponding molecular formula?
user
C18H22F2N4O
assistant