Using BrC(Br)(Br)Br, COc1cccc2nc(-c3cc(C)c(OCCO)c(C)c3)[nH]c(=O)c12 to produce COc1cccc2nc(-c3cc(C)c(OCCBr)c(C)c3)[nH]c(=O)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.