Using COc1ccc(-c2cc(-c3ccccn3)nc(-c3cccc(Br)n3)c2)cc1, O=C=O to produce COc1ccc(-c2cc(-c3ccccn3)nc(-c3cccc(C(=O)O)n3)c2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.