Using COc1ccc2c(c1)CC[C@]1(C=O)C2=C(CCCCCOCc2ccccc2)C[C@]2(C)[C@@H](O[Si](C)(C)C(C)(C)C)CC[C@H]21 to produce COc1ccc2c(c1)CC[C@@]1(C=O)[C@@H]3CC[C@H](O[Si](C)(C)C(C)(C)C)[C@@]3(C)C[C@H](CCCCCO)[C@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.