Using COc1ccc(Oc2ccnc3cc(OC)c(OC)cc23)c(C(O)c2nccs2)c1 to produce COc1ccc(Oc2ccnc3cc(OC)c(OC)cc23)c(C(=O)c2nccs2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.