Using CCOC(=O)C[C@H](Cc1ccc(N)c(C)c1COC(C)=O)C(=O)OCC, BrBr to produce CCOC(=O)C[C@H](Cc1cc(Br)c(N)c(C)c1COC(C)=O)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.