Using COc1ccc(Br)c(OCC2C=CCN2C(=O)OC(C)(C)C)c1 to produce COc1ccc2c(c1)OCC1C2CCN1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.