Using CCO, Cc1ccccc1OCC(O)COc1cccc2oc(C(=O)O)cc(=O)c12 to produce CCOC(=O)c1cc(=O)c2c(OCC(O)COc3ccccc3C)cccc2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.