Using O=C1CCC(=O)N1Br, COCCCn1ncc2ccc(C[C@@H](CO)C(C)C)cc21 to produce COCCCn1ncc2ccc(C[C@@H](CBr)C(C)C)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.