You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[(3S,4R)-3-hydroxy-4-phenylpiperidine-1-carbonyl]-1,5,6,7-tetrahydrocyclopenta[b]pyridin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22N2O3
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