You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2-hydroxy-2-phenylethyl)-5-phenyl-1,3,3a,4,6,6a-hexahydrocyclopenta[c]pyrrol-5-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H25NO2
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