Using CCOC(=O)CON=c1c2nccc3c(Cl)ccc(c32)n2cccc12 to produce O=C(O)CON=c1c2nccc3c(Cl)ccc(c32)n2cccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.