Using C=CCBr, COc1cc(C)c2c(ccn2C(=O)OC(C)(C)C)c1C(C)C#N to produce C=CCC(C)(C#N)c1c(OC)cc(C)c2c1ccn2C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.