You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-[(3S)-1-(2,5-dimethylpyrazol-3-yl)-2-oxopiperidin-3-yl]piperazine-1-carbonyl]cyclobutane-1-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H28N6O2
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