Using CCn1nc(-c2ccccn2)c(C(CC=COC)c2ccc(Br)cc2)c1NC(=O)OC(C)(C)C to produce CCn1nc(-c2ccccn2)c(C(CCC=O)c2ccc(Br)cc2)c1NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.