Using CCOC(=O)c1cc2cc(O)c(Cl)nc2n1C(=O)OC(C)(C)C, CCBr to produce CCOC(=O)c1cc2cc(OCC)c(Cl)nc2n1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.