Using OC1CCCC1, CCOC(=O)c1ccc(NC(=O)OC(C)(C)C)cc1O to produce CCOC(=O)c1ccc(NC(=O)OC(C)(C)C)cc1OC1CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.