Using CCc1cc(CCN2C(=O)c3ccccc3C2=O)c(OC)nc1C to produce CCc1cc(CCN2C(=O)c3ccccc3C2=O)c(=O)[nH]c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.