Using CCc1cc(CCc2nc3c(C)ccc(C)c3o2)c(OC)nc1C to produce CCc1cc(CCc2nc3c(C)ccc(C)c3o2)c(=O)[nH]c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.