Using COC(=O)C(Br)CCBr, COC(=O)C(C#N)C(C)c1ccccc1 to produce COC(=O)C(CCBr)C(C#N)(C(=O)OC)C(C)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.