Using CCOC(=O)c1c(Oc2cccc(OC)c2)cccc1Oc1ccc2c(c1)OCO2 to produce COc1cccc(Oc2cccc(Oc3ccc4c(c3)OCO4)c2C(=O)O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.