You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-(2-fluoro-4-methoxyphenyl)-5-methyl-4-[[4-(2-methylpropyl)piperazin-1-yl]methyl]-1,3-oxazole into its molecular formula.
user
C20H28FN3O2
assistant