Using O=C([O-])[O-], COC(=O)CCNC(=O)Nc1ncc(Br)cc1C(=O)O to produce COC(=O)CCn1c(=O)c2cc(Br)cnc2n(C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.