Using COC(=O)Cc1ccc2occ(-c3ccc(Br)cc3)c2c1, c1ccncc1 to produce COC(=O)Cc1ccc2occ(-c3ccc(C#N)cc3)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.