You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[5-[3-[(4-cyclopropylpyrimidin-2-yl)amino]phenyl]-1,3-oxazol-2-yl]-3-methylpiperazin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N6O2
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