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