Using O=C1NCc2c(Br)cc(O)cc21, CC(C)(C)OC(=O)CBr to produce CC(C)(C)OC(=O)COc1cc(Br)c2c(c1)C(=O)NC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.