You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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N-[(5-chlorothiophen-2-yl)methyl]-N,5-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-7-amine is the IUPAC name of a molecule. Please give its molecular formula.
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C12H12ClN5S
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