You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 7-(4-bromophenyl)-5-[(5-phenyl-1,3,4-thiadiazol-2-yl)sulfanylmethyl]-4,7-dihydrotetrazolo[1,5-a]pyrimidine-6-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
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C22H18BrN7O2S2
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