You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-3-[[3-(2-phenylethyl)-1H-1,2,4-triazol-5-yl]methyl]-2,3-dihydrothiophene 1,1-dioxide is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H17N3O2S
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