You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-1'-benzyl-2-(3-methylbutyl)spiro[1,2-benzothiazole-3,3'-pyrrolidine] 1,1-dioxide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H28N2O2S
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