Using CC(=O)[C@H]1CC[C@H]2[C@@H]3CC[C@H]4C[C@H](OC5CCCCO5)CC[C@]4(C)[C@H]3C(=O)C[C@]12C, CCOC(=O)OCC to produce CCOC(=O)CC(=O)[C@H]1CC[C@H]2[C@@H]3CC[C@H]4C[C@H](O)CC[C@]4(C)[C@H]3C(=O)C[C@]12C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.