Using Cc1nc(O)nn1-c1cccc(Cl)c1, CCOC(=O)C(C)Br to produce CCOC(=O)C(C)Oc1nc(C)n(-c2cccc(Cl)c2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.