You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[6-[[[(3R,4S)-4-methylpyrrolidin-3-yl]amino]methyl]-3-oxo-1H-isoindol-2-yl]piperidine-2,6-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H24N4O3
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