Using COCCN1CC(c2ccccc2)CCCC1=O, CC(C)(C)OC(=O)CBr to produce COCCN1CC(c2ccccc2)CCC(CC(=O)OC(C)(C)C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.