Using CCCCOc1nc(N)c2[nH]c(=O)n(CCOc3cccc(C(=O)OC)c3)c2n1 to produce CCCCOc1nc(N)c2[nH]c(=O)n(CCOc3cccc(C(=O)O)c3)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.