You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name 4-methyl-5-[2-[methyl-(5-methyl-[1,2,4]triazolo[1,5-a]pyrimidin-7-yl)amino]acetyl]-3,4-dihydro-1H-1,5-benzodiazepin-2-one into its molecular formula.
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C19H21N7O2
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