Using CCCC(=O)Oc1ccc(C(=O)CNC(C)(C)C)cc1OC(=O)CCC to produce CCCC(=O)Oc1ccc(C(O)CNC(C)(C)C)cc1OC(=O)CCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.