Using O=C1c2ccccc2C(=O)N1CCCOc1ccc(-c2nc3cc(Br)cnc3[nH]2)cc1 to produce NCCCOc1ccc(-c2nc3cc(Br)cnc3[nH]2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.