Using O=C1NC(=O)c2ccccc21, CC(=O)Oc1c(C)c(C)c2c(c1C)C(CBr)C(C)(C)O2 to produce CC(=O)Oc1c(C)c(C)c2c(c1C)C(CN1C(=O)c3ccccc3C1=O)C(C)(C)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.