Using CC[C@@H]1C2C(=O)C[C@H]3[C@@H]4CC[C@H](O)[C@@]4(C)CC[C@@H]3[C@@]2(C)CC[C@H]1O to produce CC[C@H]1C(=O)CC[C@@]2(C)C1C(=O)C[C@@H]1[C@@H]2CC[C@]2(C)C(=O)CC[C@@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.