You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[6-(3,5-dimethyl-1,2-oxazol-4-yl)-2-methylpyrimidin-4-yl]piperidin-1-yl]-pyrazin-2-ylmethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22N6O2
assistant