Using COC(=O)C(C)(C)Br, CC(C)(C)[Si](OCCCc1ccc(O)cc1)(c1ccccc1)c1ccccc1 to produce COC(=O)C(C)(C)Oc1ccc(CCCO[Si](c2ccccc2)(c2ccccc2)C(C)(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.