Using CC(C)(C)OC(=O)Oc1ccc(Br)cc1, C=C[Si](OC)(OC)OC to produce CO[Si](C=Cc1ccc(OC(=O)OC(C)(C)C)cc1)(OC)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.