You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named (3R)-3-[[2-(1-methylpyrazol-4-yl)-[1,2,4]triazolo[1,5-c]quinazolin-5-yl]amino]azepan-2-one by IUPAC nomenclature, provide its molecular formula.
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C19H20N8O
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