Using O=C1CCC(=O)N1Br, Cc1ccc([C@@H](C(=O)OC(C)(C)C)C2CCCC2)cc1 to produce CC(C)(C)OC(=O)[C@H](c1ccc(CBr)cc1)C1CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.