Using CC1CN(C(=O)OC(C)(C)C)C(=C=O)C(C)N1, COC(=O)CBr to produce COC(=O)N1C(C)CN(C(=O)OC(C)(C)C)C(C)C1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.