You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (2R,4aR,6S,7R,9aS)-6-[(Z)-2-bromoethenyl]-2-phenyl-4a,6,7,8,9,9a-hexahydro-4H-[1,3]dioxino[5,4-b]oxepin-7-ol into molecular formula.
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C16H19BrO4
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