You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (3R)-3-[2-[3-(8-amino-5-methylpyrido[3,4-d]pyrimidin-2-yl)-5-methylphenyl]ethynyl]-3-hydroxy-1-methylpyrrolidin-2-one .
user
C22H21N5O2
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