Using CCOC(=O)C1CC(C(=O)OCC)CN(C(=O)OC(C)(C)C)C1 to produce CCOC(=O)C1CC(C(=O)O)CN(C(=O)OC(C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.