Using O=C(Nc1ccccc1)[C@@H]1CCc2ncc(N(Cc3ccccc3)C(=O)OCc3ccccc3)c(=O)n21, CC(C)(C)OC(=O)CBr to produce CC(C)(C)OC(=O)C[C@H]1C[C@@H](C(=O)Nc2ccccc2)n2c1ncc(N(Cc1ccccc1)C(=O)OCc1ccccc1)c2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.