Using O=C1CCC(=O)N1Br, CN1CCn2cccc2C12CCN(C(=O)OC(C)(C)C)CC2 to produce CN1CCn2c(Br)ccc2C12CCN(C(=O)OC(C)(C)C)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.