Using C=CCOc1c(C)sc(C(=O)CCC(=O)c2cc(OC)c(OC)c(OC)c2)c1OC to produce C=CCOc1c(C)sc(C(O)CCC(O)c2cc(OC)c(OC)c(OC)c2)c1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.