Using O=C1CCC(=O)N1Br, COCCCNC(=O)c1ccc(-n2ncc(C(=O)O)c2OC)nc1 to produce COCCCNC(=O)c1ccc(-n2ncc(Br)c2OC)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.