Using COC(=O)[C@@H]1CCCN1C(=O)OC(C)(C)C, CC(C)=CCBr to produce COC(=O)C1(CC=C(C)C)CCCN1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.