Using COC(=O)c1ccnc(NC(=O)COc2ccc(Br)cc2Cl)c1 to produce O=C(COc1ccc(Br)cc1Cl)Nc1cc(C(=O)O)ccn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.