You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 5-(4-bromophenyl)-9-methyl-1,3,5-triazaspiro[5.5]undeca-1,3-diene-2,4-diamine;hydrochloride is given. What is its corresponding molecular formula?
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C15H21BrClN5
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