Using C[C@]12CC[C@H]3[C@@H](CC[C@H]4C[C@@H](O)CC[C@@]43CO[Si](C)(C)C)[C@@H]1CC[C@@H]2O to produce C[C@]12CC[C@H]3[C@@H](CC[C@H]4CC(=O)CC[C@@]43CO[Si](C)(C)C)[C@@H]1CCC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.