Using CC(=O)OC(C)=O, O=C(O)c1cc(O)c(O)c(O)c1 to produce CC(=O)Oc1cc(C(=O)O)cc(OC(C)=O)c1OC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.