Using C[C@]12CC[C@H]3[C@@H](CCC4=CC(=O)[C@H]5C[C@H]5[C@@]43CO)[C@@H]1CCC2=O to produce C[C@@H]1CC(=O)C=C2CC[C@@H]3[C@H](CC[C@]4(C)C(=O)CC[C@@H]34)[C@]21CO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.