Using CCCN(CCC)c1cc(CO)c(=O)n2c(-c3c(C)cc(C)cc3C)cccc12 to produce CCCN(CCC)c1cc(C=O)c(=O)n2c(-c3c(C)cc(C)cc3C)cccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.