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system
Name the molecular formula for the molecule established as (1S,13R,14S,17S,20R)-20-amino-10-bromo-13,14,18,18-tetramethyl-2-oxa-6-azapentacyclo[11.8.0.01,17.03,11.04,8]henicosa-3,8,10-trien-7-one using the IUPAC nomenclature.
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C23H31BrN2O2
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