Using CC(C)C[C@H](CO)NC(=O)c1cnc(Cl)c(Br)c1, COC(C)(C)OC to produce CC(C)C[C@@H]1COC(C)(C)N1C(=O)c1cnc(Cl)c(Br)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.