Using CCCn1c(=O)c2[nH]c(C3C4CCC3C(=O)C4)nc2n(CCC)c1=O to produce CCCn1c(=O)c2[nH]c(C3C4CCC3C(O)C4)nc2n(CCC)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.