Using CCOC(=O)CBr, CCn1ccc(-c2nc(-c3ccc(-c4ncon4)cc3)c(Sc3ccc(Cl)cc3)n2C)n1 to produce CCOC(=O)Cn1ccc(-c2nc(-c3ccc(C#N)cc3)c(Sc3ccc(Cl)cc3)n2C)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.