Using O, COC(OC)C(C)[C@H]1CC[C@H]2[C@@H]3C=C[C@@]45O[C@]46OC(C[C@]5(C)[C@H]3CC[C@]12C)C6=O to produce COC(OC)C(C)[C@H]1CC[C@H]2[C@@H]3C=C[C@@]4(O)C[C@@H](O)C[C@H](O)[C@]4(C)[C@H]3CC[C@]12C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.