You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-[2-(4-ethylphenyl)-5-methyl-1,3-oxazol-4-yl]-1-(4-pyrimidin-2-ylpiperazin-1-yl)ethanone .
user
C22H25N5O2
assistant