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What is the molecular formula of the molecule identified by [2-(4-bromophenyl)-2-oxoethyl] 3-[(1S,2R,6S,7S,8R,9S)-8,9-dibromo-3,5-dioxo-4-azatricyclo[5.2.1.02,6]decan-4-yl]propanoate ?
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C20H18Br3NO5
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