Using CC(=O)OC[C@]12CC[C@H](OC(C)=O)CC1=CC[C@@H]1[C@@H]2CC[C@]2(C)[C@@H](OC(C)=O)CC[C@@H]12 to produce CC(=O)O[C@H]1CC[C@H]2[C@@H]3CC=C4C[C@@H](O)CC[C@]4(CO)[C@H]3CC[C@]12C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.