Using O=C1CCC(=O)N1Br, Cc1nccn2c([C@@H]3CCN(C(=O)OCc4ccccc4)C3)ncc12 to produce Cc1nccn2c([C@@H]3CCN(C(=O)OCc4ccccc4)C3)nc(Br)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.