Using CC(C)(C)OC(=O)NCCBr, COC(=O)c1ccc(C#N)c(O)c1 to produce COC(=O)c1ccc(C#N)c(OCCNC(=O)OC(C)(C)C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.