You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-1-[1-(5,6,7,8-tetrahydronaphthalen-2-ylsulfonyl)pyrrolidin-3-yl]benzimidazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H25N3O2S
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