Using O=C1CCC(=O)N1Br, CC(=O)O[C@@H]1[C@H](OC(C)=O)[C@@H](C)O[C@H]1n1cnc2ccc(Cl)cc21 to produce CC(=O)O[C@@H]1[C@H](OC(C)=O)[C@@H](C)O[C@H]1n1c(Br)nc2ccc(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.