You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (4R)-1-cyclopentyl-4-[2-[(2S)-1-methylpyrrolidin-2-yl]-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine-6-carbonyl]pyrrolidin-2-one .
user
C22H31N5O2
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