You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[3-acetyl-2-(2-methoxyphenyl)-2H-1,3,4-oxadiazol-5-yl]-4-(2-fluorophenyl)-6-methyl-3,4-dihydro-1H-pyrimidin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H21FN4O4
assistant