Using O=C(Nc1cc(Cl)cc(Cl)c1)NC1(Cc2ccc(Br)cc2)CCCCC1=O to produce O=C1NC2(Cc3ccc(Br)cc3)CCCC=C2N1c1cc(Cl)cc(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.