You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[[4-[2-[(2S)-2-methylazetidin-1-yl]-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl]phenyl]methyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24N4O
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