You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-[[(4R)-4-hydroxy-1-(5-propan-2-yl-1H-pyrazole-3-carbonyl)azepan-4-yl]methyl]piperazin-1-yl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H33N5O3
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