Using CCOC(=O)C[C@H]1CC[C@H](c2ccc(-c3cc(OCC(=O)C45CC6CC(CC(C6)C4)C5)n[nH]3)cc2)CC1 to produce CCOC(=O)C[C@H]1CC[C@H](c2ccc(-c3cc(OCC(O)C45CC6CC(CC(C6)C4)C5)n[nH]3)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.