Using COc1cc(C)c(C(O)c2c(Br)cncc2Br)c(OC)c1OC, C1CCOC1 to produce COc1cc(C)c(C(O)c2c(C)cncc2Br)c(OC)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.