You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[6-(2-amino-6-methylpyrimidin-4-yl)-3-oxo-1H-isoindol-2-yl]amino]piperidine-2,6-dione The above is the IUPAC name of a molecule. Write its molecular formula.
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C18H18N6O3
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