Using CCOC(=O)C(Cc1ccc(OCc2nc(C(C)(C)C)oc2C)cc1C)OCC to produce CCOC(Cc1ccc(OCc2nc(C(C)(C)C)oc2C)cc1C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.