You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5S)-5-(7-benzyl-3,7-diazabicyclo[3.3.1]nonane-3-carbonyl)-1-[(2,6-dichlorophenyl)methyl]pyrrolidin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H29Cl2N3O2
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