You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methylsulfonyl-5-[(3-phenyl-8-azabicyclo[3.2.1]oct-2-en-8-yl)methyl]-1,3,4-thiadiazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C17H19N3O2S2
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