Using O=c1cc(O)cc[nH]1, O=C(O)CCC(=O)OCc1ccccc1 to produce O=C(CCC(=O)Oc1cc[nH]c(=O)c1)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.