Using COc1nc(C)c(N2CCCn3c2nc2c(Cl)ccc(CO)c23)c(C)n1 to produce COc1nc(C)c(N2CCCn3c2nc2c(Cl)ccc(C=O)c23)c(C)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.