Using CN1CCCC1=O, CCOC(=O)c1sc(-c2cc(Br)c3ccccc3c2)nc1C to produce CCOC(=O)c1sc(-c2cc(C#N)c3ccccc3c2)nc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.