Using CSc1ncc2cc(-c3cc(CO)ccc3C)c(=O)n(C)c2n1 to produce CSc1ncc2cc(-c3cc(C=O)ccc3C)c(=O)n(C)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.