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Name the molecular formula for the molecule established as (4-bromophenyl) (2S)-2-[(1S,2S,6R,7R,8S,10R)-3,5-dioxo-4-azatetracyclo[5.3.2.02,6.08,10]dodec-11-en-4-yl]propanoate using the IUPAC nomenclature.
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C20H18BrNO4
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