Using COC(=O)COc1cccc(C=CC(=O)c2c(O)cc(C)[nH]c2=O)c1 to produce Cc1cc(O)c(C(=O)C=Cc2cccc(OCC(=O)O)c2)c(=O)[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.