Using CCCc1c(OCc2cccc(Nc3cc(C(=O)OC)ccn3)c2)ccc(C(C)=O)c1O to produce CCCc1c(OCc2cccc(Nc3cc(C(=O)O)ccn3)c2)ccc(C(C)=O)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.