You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[2-[(1R)-1-(4-chlorophenyl)-2,2,2-trideuterio-1-phenylethoxy]-1,1-dideuterioethyl]-2,3,3,4,4,5,5-heptadeuterio-1-methylpyrrolidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26ClNO
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