Using C=C(Br)CBr, CCOC(=O)C1CCN(C(=O)OC(C)(C)C)CC1 to produce C=C(Br)CC1(C(=O)OCC)CCN(C(=O)OC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.