Using CCOC(=O)c1cc(=O)c2c(ccc3nc(C(=O)OC)cc(Cl)c32)o1 to produce O=C(O)c1cc(Cl)c2c(ccc3oc(C(=O)O)cc(=O)c32)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.