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)-7-methoxy-3,4-dihydro-2H-chromen-3-yl]-[(2S)-2-pyridin-2-ylpyrrolidin-1-yl]methanone .
user
C20H22N2O3
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