Using C[C@]1(O)C[C@]2(C)C(=O)CC[C@H]2[C@@H]2CCC3=CC(=O)CC[C@]3(C)[C@H]21 to produce C=C1C[C@]2(C)C(=O)CC[C@H]2[C@@H]2CCC3=CC(=O)CC[C@]3(C)[C@@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.