You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(3,5-dimethyl-1,2-oxazol-4-yl)-1-[4-(2-piperidin-1-ylpyrimidin-4-yl)piperazin-1-yl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H28N6O2
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