Using Cc1cc(Br)cnc1CCCn1nnc2cc(Cc3cccnc3)cnc21, O to produce Cc1cc(Br)cnc1CCCNc1ncc(Cc2cccnc2)cc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.