Using CC(=O)Oc1cccc(-c2coc3c(C)c(OC(C)=O)ccc3c2=O)c1 to produce CC(=O)Oc1cccc(C2COc3c(ccc(OC(C)=O)c3C)C2O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.