Using CCCC(=O)CC(=O)OCC, OCCc1c[nH]c2ccc(OCc3ccccc3)cc12 to produce CCCC1(CC(=O)OCC)OCCc2c1[nH]c1ccc(OCc3ccccc3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.