Using C[C@]12CC[C@@H]3c4ccc(O)cc4C[C@@H](CCCCCO)[C@H]3[C@@H]1C=CC21OCCO1 to produce C[C@]12CC[C@@H]3c4ccc(O)cc4C[C@@H](CCCCCO)[C@H]3[C@@H]1C=CC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.