Using CC(C)(C)OC(=O)N1CCCC(C(=O)O)(C(=O)OCc2ccccc2)C1, CC(C)(C)C(=O)CBr to produce CC(C)(C)OC(=O)N1CCCC(C(=O)OCC(=O)C(C)(C)C)(C(=O)OCc2ccccc2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.