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 [(8R)-2-[(2R,6S)-2,6-dimethylmorpholin-4-yl]spiro[5,7-dihydropyrano[4,3-d]pyrimidine-8,3'-pyrrolidine]-1'-yl]-(1-methylpyrazol-3-yl)methanone .
user
C21H28N6O3
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