Using CC(C)OB1OC(C)(C)C(C)(C)O1, Cn1cc(Br)c(C2CC2)n1 to produce Cn1cc(B2OC(C)(C)C(C)(C)O2)c(C2CC2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.