You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,5R)-3-benzyl-6-pyrrolidin-1-ylsulfonyl-3,6-diazabicyclo[3.2.2]nonane is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H27N3O2S
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