Using O=C(Cl)CCCCl, CC1(C)COC(C(C)(C)c2ccc(Br)cc2)=N1 to produce CC1(C)COC(C(C)(C)c2ccc(C(=O)CCCCl)cc2)=N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.