Using COc1nc2cc(Br)cc(CNC(=O)c3ccco3)c2nc1OC to produce O=C(NCc1cc(Br)cc2[nH]c(=O)c(=O)[nH]c12)c1ccco1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.