Using COB(OC)OC, CC(C)[Si](C(C)C)(C(C)C)n1ccc2cc(Br)cnc21 to produce CC(C)[Si](C(C)C)(C(C)C)n1ccc2cc(O)cnc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.