You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-chloro-3,3-dimethyl-2-[5-[(1H-pyrazol-5-ylamino)methyl]pyridin-3-yl]isoindol-1-one The above is the IUPAC name of a molecule. Write its molecular formula.
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C19H18ClN5O
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