Using CCC(O)c1ccc(Cl)c2nc3n(c12)CCCN3c1c(C)nc(OC)nc1C to produce CCC(=O)c1ccc(Cl)c2nc3n(c12)CCCN3c1c(C)nc(OC)nc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.