Using O=C(O)CCC(=O)c1cc(Br)c(O)c(Br)c1, NNCc1cccc(O)c1 to produce O=C1CCC(c2cc(Br)c(O)c(Br)c2)=NN1Cc1cccc(O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.