Using BrCc1ccc(Br)cc1, COC(=O)N[C@H](C(=O)NNCC[C@@](O)(Cc1ccccc1)C(=O)N1[C@H]2c3ccccc3C[C@H]2OC1(C)C)C(C)(C)C to produce COC(=O)N[C@@H](C(=O)NN(CC[C@](O)(Cc1ccccc1)C(=O)N[C@H]1c2ccccc2C[C@H]1O)Cc1ccc(Br)cc1)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.