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 2-[(1S)-1-[[5-[(E)-1-bromo-2-(methylamino)ethenyl]pyrimidin-4-yl]amino]ethyl]-5-chloro-3-(methylamino)-9aH-cyclohepta[d]pyrimidin-4-one is given. What is its corresponding molecular formula?
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C19H21BrClN7O
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