Using O=C1CCC(=O)N1Br, Cc1cc2c3c(ccc2cc1C#N)OC(=O)C3(C)C to produce CC1(C)C(=O)Oc2ccc3cc(C#N)c(CBr)cc3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.