Using CC(=O)OC(C)=O, CCOC(=O)COc1ccccc1OCC(=O)OCC to produce CCOC(=O)COc1ccc(C(C)=O)cc1OCC(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.