Using CC(C)(C)[Si](C)(C)OCCCBr, COc1cccc2cc(C=O)oc12 to produce COc1cccc2cc(C(O)CCCO[Si](C)(C)C(C)(C)C)oc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.