Using CCCc1c(SCCCCSc2nc3ccc(C(=O)OCC)cc3[nH]2)ccc(C(C)=O)c1O to produce CCCc1c(SCCCCSc2nc3ccc(C(=O)O)cc3[nH]2)ccc(C(C)=O)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.