Using CCOC(=O)COc1cccc(OC)c1, CCOC(=O)C(=O)OCC to produce CCOC(=O)C(=O)C(Oc1cccc(OC)c1)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.