Using CN(C)C=O, CC(C)(C)OC(=O)NC1(c2ccc(Br)cc2)CC2(C1)OCCO2 to produce CC(C)(C)OC(=O)NC1(c2ccc(C#N)cc2)CC2(C1)OCCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.