Using BrC(Br)(Br)Br, O=C1NC(=O)C(c2ccc(OCCCO)c3ccoc23)=C1c1cn2c3c(cccc13)CCC2 to produce O=C1NC(=O)C(c2ccc(OCCCBr)c3ccoc23)=C1c1cn2c3c(cccc13)CCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.