You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4-fluorophenyl)-[2-methyl-4-[6-(2-methylphenoxy)pyrimidin-4-yl]piperazin-1-yl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C23H23FN4O2
assistant