Using COc1cc(OC)c(CC(=O)Nc2cccc(C(=O)O)c2)c(OC)c1 to produce O=C(Cc1c(O)cc(O)cc1O)Nc1cccc(C(=O)O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.