Using CCCN, Cc1nc2ccc(C(=O)c3nc(Br)c4ccccn34)cc2c(=O)o1 to produce CCCn1c(C)nc2ccc(C(=O)c3nc(Br)c4ccccn34)cc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.