You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(4-chlorophenyl)-1-[4-[2-(5-methyl-1,2-oxazol-3-yl)acetyl]piperazin-1-yl]propan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H22ClN3O3
assistant