Using Cc1cccc(C(=O)Cc2ccnc3ccc(Br)cc23)n1, NN1CCCC1=O to produce Cc1cccc(C(Cc2ccnc3ccc(Br)cc23)=NN2CCCC2=O)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.